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González DA, de la Torre VSG, Fernández RR, Barreau L, Merlot S. Divergent roles of IREG/Ferroportin transporters from the nickel hyperaccumulator Leucocroton havanensis. PHYSIOLOGIA PLANTARUM 2024; 176:e14261. [PMID: 38527955 DOI: 10.1111/ppl.14261] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2023] [Revised: 03/02/2024] [Accepted: 03/05/2024] [Indexed: 03/27/2024]
Abstract
In response to our ever-increasing demand for metals, phytotechnologies are being developed to limit the environmental impact of conventional metal mining. However, the development of these technologies, which rely on plant species able to tolerate and accumulate metals, is partly limited by our lack of knowledge of the underlying molecular mechanisms. In this work, we aimed to better understand the role of metal transporters of the IRON REGULATED 1/FERROPORTIN (IREG/FPN) family from the nickel hyperaccumulator Leucocroton havanensis from the Euphorbiaceae family. Using transcriptomic data, we identified two homologous genes, LhavIREG1 and LhavIREG2, encoding divalent metal transporters of the IREG/FPN family. Both genes are expressed at similar levels in shoots, but LhavIREG1 shows higher expression in roots. The heterologous expression of these transporters in A. thaliana revealed that LhavIREG1 is localized to the plasma membrane, whereas LhavIREG2 is located on the vacuole. In addition, the expression of each gene induced a significant increase in nickel tolerance. Taken together, our data suggest that LhavIREG2 is involved in nickel sequestration in vacuoles of leaf cells, whereas LhavIREG1 is mainly involved in nickel translocation from roots to shoots, but could also be involved in metal sequestration in cell walls. Our results suggest that paralogous IREG/FPN transporters may play complementary roles in nickel hyperaccumulation in plants.
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Affiliation(s)
- Dubiel Alfonso González
- Jardín Botánico Nacional, Universidad de La Habana, La Habana, Cuba
- Universidad Agraria de La Habana, Facultad de Agronomía, San José de las Lajas, Mayabeque, Cuba
| | | | - Rolando Reyes Fernández
- Universidad Agraria de La Habana, Facultad de Agronomía, San José de las Lajas, Mayabeque, Cuba
| | - Louise Barreau
- Université Paris-Saclay, CEA, CNRS, Institute for Integrative Biology of the Cell (I2BC), Gif-sur-Yvette, France
| | - Sylvain Merlot
- Université Paris-Saclay, CEA, CNRS, Institute for Integrative Biology of the Cell (I2BC), Gif-sur-Yvette, France
- Laboratoire de Recherche en Sciences Végétales (LRSV), UMR5546 CNRS/UPS/INPT, France
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Han L, Wu X, Hou K, Zhang H, Liang X, Chen C, Wang Z, Shen C. Identification and functional analysis of calcium sensor calmodulins from heavy metal hyperaccumulator Noccaea caerulescens. FUNCTIONAL PLANT BIOLOGY : FPB 2023; 50:294-302. [PMID: 36683141 DOI: 10.1071/fp22243] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2022] [Accepted: 01/06/2023] [Indexed: 06/17/2023]
Abstract
Noccaea caerulescens (J. Presl & C. Presl) F. K. Mey. is a heavy metal hyperaccumulator exhibiting extreme tolerance to various environmental stresses. To date, the functional role of Ca2+ -binding protein in this plant is largely unknown. To investigate the function of calmodulins (CaMs) in N. caerulescens , CaM2 , a Ca2+ sensor encoding gene, was identified and functionally characterised. Protein structure analysis showed that NcCaM2 contains four classic exchange factor (EF)-hand motifs with high sequence similarity to the CaM proteins from model plant Arabidopsis thaliana L. Tissue specific expression analysis showed that NcCaM2 is constitutively expressed in stems, leaves, and roots. Expression level of NcCaM2 was significantly upregulated under various environmental stimulus, indicating a potential involvement of NcCaM2 in the tolerance to abiotic stresses. The heterologous expression of NcCaM2 in a yeast mutant strain increased the heavy metal tolerance in yeast cells. Furthermore, the constitutive expression of NcCaM2 enhanced the heavy metal tolerance capability of transgenic tobacco (Nicotiana tabacum L.) plants. Our data suggested an important role of NcCaM2 in the responses to environmental stresses and provided a potential target gene to enhance of the ability to hyperaccumulate metals.
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Affiliation(s)
- Lu Han
- College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 310036, China; and Zhejiang Key Laboratory of Organ Development and Regeneration, College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou, Zhejiang 310036, China
| | - Xiaohua Wu
- College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 310036, China; and Zhejiang Key Laboratory of Organ Development and Regeneration, College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou, Zhejiang 310036, China
| | - Kailin Hou
- College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 310036, China; and Zhejiang Provincial Key Laboratory for Genetic Improvement and Quality Control of Medicinal Plants, Hangzhou Normal University, Hangzhou 310036, China
| | - Hongshan Zhang
- College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 310036, China; and Zhejiang Provincial Key Laboratory for Genetic Improvement and Quality Control of Medicinal Plants, Hangzhou Normal University, Hangzhou 310036, China
| | - Xueshuang Liang
- College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 310036, China; and Zhejiang Provincial Key Laboratory for Genetic Improvement and Quality Control of Medicinal Plants, Hangzhou Normal University, Hangzhou 310036, China
| | - Cheng Chen
- College of Pharmacy, Hangzhou Normal University, Hangzhou 311121, China
| | - Zhijing Wang
- College of Pharmacy, Hangzhou Normal University, Hangzhou 311121, China
| | - Chenjia Shen
- College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 310036, China; and Zhejiang Provincial Key Laboratory for Genetic Improvement and Quality Control of Medicinal Plants, Hangzhou Normal University, Hangzhou 310036, China
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3
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Zahra S, Shaheen T, Qasim M, Mahmood-Ur-Rahman, Hussain M, Zulfiqar S, Shaukat K, Mehboob-Ur-Rahman. Genome-wide survey of HMA gene family and its characterization in wheat ( Triticum aestivum). PeerJ 2023; 11:e14920. [PMID: 36890869 PMCID: PMC9987320 DOI: 10.7717/peerj.14920] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2022] [Accepted: 01/27/2023] [Indexed: 03/06/2023] Open
Abstract
Background Abiotic stresses, particularly drought and heavy metal toxicity, have presented a significant risk to long-term agricultural output around the world. Although the heavy-metal-associated domain (HMA) gene family has been widely explored in Arabidopsis and other plants, it has not been thoroughly studied in wheat (Triticum aestivum). This study was proposed to investigate the HMA gene family in wheat. Methods To analyze the phylogenetic relationships, gene structure, gene ontology, and conserved motifs, a comparative study of wheat HMA genes with the Arabidopsis genome was performed. Results A total of 27 T. aestivum proteins belonging to the HMA gene family were identified in this study, with amino acid counts ranging from 262 to 1,071. HMA proteins were found to be grouped into three subgroups in a phylogenetic tree, and closely related proteins in the tree showed the same expression patterns as motifs found in distinct subgroups. Gene structural study elucidated that intron and exon arrangement differed by family. Conclusion As a result, the current work offered important information regarding HMA family genes in the T. aestivum genome, which will be valuable in understanding their putative functions in other wheat species.
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Affiliation(s)
- Sadaf Zahra
- Department of Bioinformatics and Biotechnology, Government College University, Faisalabad, Pakistan
| | - Tayyaba Shaheen
- Department of Bioinformatics and Biotechnology, Government College University, Faisalabad, Pakistan
| | - Muhammad Qasim
- Department of Bioinformatics and Biotechnology, Government College University, Faisalabad, Pakistan
| | - Mahmood-Ur-Rahman
- Department of Bioinformatics and Biotechnology, Government College University, Faisalabad, Pakistan
| | - Momina Hussain
- Department of Biotechnology, Faculty of Life Sciences, University of Okara, Okara, Pakistan
| | - Sana Zulfiqar
- Plant Genomics and Molecular Breeding Laboratory, National Institute for Biotechnology and Genetic Engineering College, Pakistan Institute of Engineering and Applied Sciences (NIBGE-C, PIEAS), Faisalabad, Punjab, Pakistan
| | - Kanval Shaukat
- Department of Botany, University of Balochistan, Quetta, Pakistan
| | - Mehboob-Ur-Rahman
- Plant Genomics and Molecular Breeding Laboratory, National Institute for Biotechnology and Genetic Engineering College, Pakistan Institute of Engineering and Applied Sciences (NIBGE-C, PIEAS), Faisalabad, Punjab, Pakistan
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Stanton C, Sanders D, Krämer U, Podar D. Zinc in plants: Integrating homeostasis and biofortification. MOLECULAR PLANT 2022; 15:65-85. [PMID: 34952215 DOI: 10.1016/j.molp.2021.12.008] [Citation(s) in RCA: 51] [Impact Index Per Article: 25.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2021] [Revised: 12/07/2021] [Accepted: 12/21/2021] [Indexed: 05/24/2023]
Abstract
Zinc plays many essential roles in life. As a strong Lewis acid that lacks redox activity under environmental and cellular conditions, the Zn2+ cation is central in determining protein structure and catalytic function of nearly 10% of most eukaryotic proteomes. While specific functions of zinc have been elucidated at a molecular level in a number of plant proteins, wider issues abound with respect to the acquisition and distribution of zinc by plants. An important challenge is to understand how plants balance between Zn supply in soil and their own nutritional requirement for zinc, particularly where edaphic factors lead to a lack of bioavailable zinc or, conversely, an excess of zinc that bears a major risk of phytotoxicity. Plants are the ultimate source of zinc in the human diet, and human Zn deficiency accounts for over 400 000 deaths annually. Here, we review the current understanding of zinc homeostasis in plants from the molecular and physiological perspectives. We provide an overview of approaches pursued so far in Zn biofortification of crops. Finally, we outline a "push-pull" model of zinc nutrition in plants as a simplifying concept. In summary, this review discusses avenues that can potentially deliver wider benefits for both plant and human Zn nutrition.
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Affiliation(s)
| | - Dale Sanders
- John Innes Centre, Colney Lane, Norwich, NR4 7UH, UK
| | - Ute Krämer
- Molecular Genetics and Physiology of Plants, Ruhr University Bochum, 44801 Bochum, Germany.
| | - Dorina Podar
- Department of Molecular Biology and Biotechnology and Centre for Systems Biology, Biodiversity and Bioresources, Babes-Bolyai University, 400084 Cluj-Napoca, Romania.
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van der Ent A, de Jonge MD, Echevarria G, Aarts MGM, Mesjasz-Przybyłowicz J, Przybyłowicz WJ, Brueckner D, Harris HH. OUP accepted manuscript. Metallomics 2022; 14:6615454. [PMID: 35746898 PMCID: PMC9226517 DOI: 10.1093/mtomcs/mfac026] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2021] [Accepted: 03/18/2022] [Indexed: 11/13/2022]
Abstract
The molecular biology and genetics of the Ni–Cd–Zn hyperaccumulator Noccaea caerulescens has been extensively studied, but no information is yet available on Ni and Zn redistribution and mobilization during seed germination. Due to the different physiological functions of these elements, and their associated transporter pathways, we expected differential tissue distribution and different modes of translocation of Ni and Zn during germination. This study used synchrotron X-ray fluorescence tomography techniques as well as planar elemental X-ray imaging to elucidate elemental (re)distribution at various stages of the germination process in contrasting accessions of N. caerulescens. The results show that Ni and Zn are both located primarily in the cotyledons of the emerging seedlings and Ni is highest in the ultramafic accessions (up to 0.15 wt%), whereas Zn is highest in the calamine accession (up to 600 μg g–1). The distribution of Ni and Zn in seeds was very similar, and neither element was translocated during germination. The Fe maps were especially useful to obtain spatial reference within the seeds, as it clearly marked the vasculature. This study shows how a multimodal combination of synchrotron techniques can be used to obtain powerful insights about the metal distribution in physically intact seeds and seedlings.
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Affiliation(s)
- Antony van der Ent
- Correspondence: Centre for Mined Land Rehabilitation, Sustainable Minerals Institute (SMI), Level 5, Sir James Foots Building (No. 47A), The University of Queensland, St Lucia QLD 4072, Australia. Tel: +61 7 3346 4003; E-mail:
| | | | - Guillaume Echevarria
- Laboratoire Sols et Environnement, Université de Lorraine-INRAE, Vandœuvre-lés-Nancy, UMR 1120, France
| | - Mark G M Aarts
- Laboratory of Genetics, Wageningen University and Research, The Netherlands
| | | | - Wojciech J Przybyłowicz
- Department of Botany and Zoology, Stellenbosch University, Matieland 7602, South Africa
- AGH University of Science and Technology, Faculty of Physics & Applied Computer Science, 30-059 Kraków, Poland
| | - Dennis Brueckner
- Deutsches Elektronen-Synchrotron DESY, 22607 Hamburg, Germany
- Department of Physics, Universität Hamburg, 20355 Hamburg, Germany
- Faculty of Chemistry and Biochemistry, Ruhr-Universität Bochum, 44801 Bochum, Germany
| | - Hugh H Harris
- Department of Chemistry, The University of Adelaide, Adelaide 5005, Australia
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Seregin IV, Kozhevnikova AD. Low-molecular-weight ligands in plants: role in metal homeostasis and hyperaccumulation. PHOTOSYNTHESIS RESEARCH 2021; 150:51-96. [PMID: 32653983 DOI: 10.1007/s11120-020-00768-1] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2020] [Accepted: 06/22/2020] [Indexed: 06/11/2023]
Abstract
Mineral nutrition is one of the key factors determining plant productivity. In plants, metal homeostasis is achieved through the functioning of a complex system governing metal uptake, translocation, distribution, and sequestration, leading to the maintenance of a regulated delivery of micronutrients to metal-requiring processes as well as detoxification of excess or non-essential metals. Low-molecular-weight ligands, such as nicotianamine, histidine, phytochelatins, phytosiderophores, and organic acids, play an important role in metal transport and detoxification in plants. Nicotianamine and histidine are also involved in metal hyperaccumulation, which determines the ability of some plant species to accumulate a large amount of metals in their shoots. In this review we extensively summarize and discuss the current knowledge of the main pathways for the biosynthesis of these ligands, their involvement in metal uptake, radial and long-distance transport, as well as metal influx, isolation and sequestration in plant tissues and cell compartments. It is analyzed how diverse endogenous ligand levels in plants can determine their different tolerance to metal toxic effects. This review focuses on recent advances in understanding the physiological role of these compounds in metal homeostasis, which is an essential task of modern ionomics and plant physiology. It is of key importance in studying the influence of metal deficiency or excess on various physiological processes, which is a prerequisite to the improvement of micronutrient uptake efficiency and crop productivity and to the development of a variety of applications in phytoremediation, phytomining, biofortification, and nutritional crop safety.
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Affiliation(s)
- I V Seregin
- K.A. Timiryazev Institute of Plant Physiology RAS, IPPRAS, Botanicheskaya st., 35, Moscow, Russian Federation, 127276.
| | - A D Kozhevnikova
- K.A. Timiryazev Institute of Plant Physiology RAS, IPPRAS, Botanicheskaya st., 35, Moscow, Russian Federation, 127276
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Comparative and Systematic Omics Revealed Low Cd Accumulation of Potato StMTP9 in Yeast: Suggesting a New Mechanism for Heavy Metal Detoxification. Int J Mol Sci 2021; 22:ijms221910478. [PMID: 34638819 PMCID: PMC8508701 DOI: 10.3390/ijms221910478] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2021] [Revised: 09/25/2021] [Accepted: 09/25/2021] [Indexed: 01/08/2023] Open
Abstract
The metal tolerance protein (MTP) family is a very old family with evolutionary conservation and less specific amplification. It seems to retain the original functions of the ancestral genes and plays an important role in maintaining metal homeostasis in plant cells. We identified the potato MTP family members for the first time, the specific and conservative StMPTs were discovered by using systematic and comparative omics. To be surprised, members of the StMTP family seem to have mutated before the evolution of dicotyledon and monocotyledon, and even the loss of the entire subfamily (subfamily G6, G7). Interestingly, StMTP9 represents the conserved structure of the entire subfamily involved in toxic metal regulation. However, the gene structure and transmembrane domain of StMTP8 have undergone specific evolution, showing that the transmembrane domain (Motif13) located at the NH2 terminal has been replaced by the signal peptide domain, so it was selected as the control gene of StMTP9. Through real-time fluorescence quantitative analysis of StMTPs under Cd and Zn stress, a co-expression network was constructed, and it was found that StMTP9 responded significantly to Cd stress, while StMTP8 did the opposite. What excites us is that by introducing StMTPs 8/9 into the ∆ycf1 yeast cadmium-sensitive mutant strain, the functional complementation experiment proved that StMTPs 8/9 can restore Cd tolerance. In particular, StMTP9 can greatly reduce the cadmium content in yeast cells, while StMTP8 cannot. These findings provide a reference for further research on the molecular mechanism of potato toxic metal accumulation.
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Tibbett M, Green I, Rate A, De Oliveira VH, Whitaker J. The transfer of trace metals in the soil-plant-arthropod system. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 779:146260. [PMID: 33744587 DOI: 10.1016/j.scitotenv.2021.146260] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2020] [Revised: 02/26/2021] [Accepted: 02/28/2021] [Indexed: 06/12/2023]
Abstract
Essential and non-essential trace metals are capable of causing toxicity to organisms above a threshold concentration. Extensive research has assessed the behaviour of trace metals in biological and ecological systems, but has typically focused on single organisms within a trophic level and not on multi-trophic transfer through terrestrial food chains. This reinforces the notion of metal toxicity as a closed system, failing to consider one trophic level as a pollution source to another; therefore, obscuring the full extent of ecosystem effects. Given the relatively few studies on trophic transfer of metals, this review has taken a compartment-based approach, where transfer of metals through trophic pathways is considered as a series of linked compartments (soil-plant-arthropod herbivore-arthropod predator). In particular, we consider the mechanisms by which trace metals are taken up by organisms, the forms and transformations that can occur within the organism and the consequences for trace metal availability to the next trophic level. The review focuses on four of the most prevalent metal cations in soil which are labile in terrestrial food chains: Cd, Cu, Zn and Ni. Current knowledge of the processes and mechanisms by which these metals are transformed and moved within and between trophic levels in the soil-plant-arthropod system are evaluated. We demonstrate that the key factors controlling the transfer of trace metals through the soil-plant-arthropod system are the form and location in which the metal occurs in the lower trophic level and the physiological mechanisms of each organism in regulating uptake, transformation, detoxification and transfer. The magnitude of transfer varies considerably depending on the trace metal concerned, as does its toxicity, and we conclude that biomagnification is not a general property of plant-arthropod and arthropod-arthropod systems. To deliver a more holistic assessment of ecosystem toxicity, integrated studies across ecosystem compartments are needed to identify critical pathways that can result in secondary toxicity across terrestrial food-chains.
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Affiliation(s)
- Mark Tibbett
- Department of Sustainable Land Management & Soil Research Centre, School of Agriculture Policy and Development, University of Reading, Whiteknights, RG6 6AR, UK.
| | - Iain Green
- Department of Life and Environmental Sciences, Faculty of Science and Technology, Bournemouth University, Poole, Dorset BH12 5BB, UK
| | - Andrew Rate
- School of Agriculture and Environment, The University of Western Australia, Perth, WA 6009, Australia
| | - Vinícius H De Oliveira
- Department of Plant Biology, Institute of Biology, University of Campinas, Campinas, Sao Paulo 13083-970, Brazil
| | - Jeanette Whitaker
- UK Centre for Ecology & Hydrology, Lancaster Environment Centre, Library Avenue, Lancaster LA1 4AP, UK
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9
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Kintlová M, Vrána J, Hobza R, Blavet N, Hudzieczek V. Transcriptome Response to Cadmium Exposure in Barley ( Hordeum vulgare L.). FRONTIERS IN PLANT SCIENCE 2021; 12:629089. [PMID: 34335638 PMCID: PMC8321094 DOI: 10.3389/fpls.2021.629089] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2020] [Accepted: 06/11/2021] [Indexed: 05/27/2023]
Abstract
Cadmium is an environmental pollutant with high toxicity that negatively affects plant growth and development. To understand the molecular mechanisms of plant response to cadmium stress, we have performed a genome-wide transcriptome analysis on barley plants treated with an increased concentration of cadmium. Differential gene expression analysis revealed 10,282 deregulated transcripts present in the roots and 7,104 in the shoots. Among them, we identified genes related to reactive oxygen species metabolism, cell wall formation and maintenance, ion membrane transport and stress response. One of the most upregulated genes was PLANT CADMIUM RESISTACE 2 (HvPCR2) known to be responsible for heavy metal detoxification in plants. Surprisingly, in the transcriptomic data we identified four different copies of the HvPCR2 gene with a specific pattern of upregulation in individual tissues. Heterologous expression of all five barley copies in a Cd-sensitive yeast mutant restored cadmium resistance. In addition, four HvPCR2 were located in tandem arrangement in a single genomic region of the barley 5H chromosome. To our knowledge, this is the first example showing multiplication of the PCR2 gene in plants.
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Affiliation(s)
- Martina Kintlová
- Czech Academy of Sciences, Centre of the Region Haná for Biotechnological and Agricultural Research, Institute of Experimental Botany, Olomouc, Czechia
| | - Jan Vrána
- Czech Academy of Sciences, Centre of the Region Haná for Biotechnological and Agricultural Research, Institute of Experimental Botany, Olomouc, Czechia
| | - Roman Hobza
- Czech Academy of Sciences, Centre of the Region Haná for Biotechnological and Agricultural Research, Institute of Experimental Botany, Olomouc, Czechia
- Czech Academy of Sciences, Institute of Biophysics, Brno, Czechia
| | - Nicolas Blavet
- Czech Academy of Sciences, Centre of the Region Haná for Biotechnological and Agricultural Research, Institute of Experimental Botany, Olomouc, Czechia
- Czech Academy of Sciences, Institute of Biophysics, Brno, Czechia
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Ricachenevsky FK, Punshon T, Salt DE, Fett JP, Guerinot ML. Arabidopsis thaliana zinc accumulation in leaf trichomes is correlated with zinc concentration in leaves. Sci Rep 2021; 11:5278. [PMID: 33674630 PMCID: PMC7935932 DOI: 10.1038/s41598-021-84508-y] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2020] [Accepted: 02/17/2021] [Indexed: 11/21/2022] Open
Abstract
Zinc (Zn) is a key micronutrient for plants and animals, and understanding Zn homeostasis in plants can improve both agriculture and human health. While root Zn transporters in plant model species have been characterized in detail, comparatively little is known about shoot processes controlling Zn concentrations and spatial distribution. Previous work showed that Zn hyperaccumulator species such as Arabidopsis halleri accumulate Zn and other metals in leaf trichomes. To date there is no systematic study regarding Zn accumulation in the trichomes of the non-accumulating, genetic model species A. thaliana. Here, we used Synchrotron X-Ray Fluorescence mapping to show that Zn accumulates at the base of trichomes of A. thaliana. Using transgenic and natural accessions of A thaliana that vary in bulk leaf Zn concentration, we demonstrate that higher leaf Zn increases total Zn found at the base of trichome cells. Our data indicates that Zn accumulation in trichomes is a function of the Zn status of the plant, and provides the basis for future studies on a genetically tractable plant species to understand the molecular steps involved in Zn spatial distribution in leaves.
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Affiliation(s)
- Felipe K Ricachenevsky
- Programa de Pós-Graduação em Biologia Celular e Molecular, Centro de Biotecnologia, Universidade Federal do Rio Grande Do Sul, Porto Alegre, Brazil. .,Departamento de Botânica, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves, Porto Alegre, RS, 9500, Brazil. .,Department of Biological Sciences, Life Sciences Center, Dartmouth College, 78 College St, Hanover, NH, 03755, USA.
| | - Tracy Punshon
- Department of Biological Sciences, Life Sciences Center, Dartmouth College, 78 College St, Hanover, NH, 03755, USA
| | - David E Salt
- Future Food Beacon of Excellence and the School of Biosciences, University of Nottingham, Nottingham, LE12 5RD, UK
| | - Janette P Fett
- Programa de Pós-Graduação em Biologia Celular e Molecular, Centro de Biotecnologia, Universidade Federal do Rio Grande Do Sul, Porto Alegre, Brazil.,Departamento de Botânica, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves, Porto Alegre, RS, 9500, Brazil
| | - Mary Lou Guerinot
- Department of Biological Sciences, Life Sciences Center, Dartmouth College, 78 College St, Hanover, NH, 03755, USA.
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11
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Cardini A, Pellegrino E, White PJ, Mazzolai B, Mascherpa MC, Ercoli L. Transcriptional Regulation of Genes Involved in Zinc Uptake, Sequestration and Redistribution Following Foliar Zinc Application to Medicago sativa. PLANTS (BASEL, SWITZERLAND) 2021; 10:476. [PMID: 33802484 PMCID: PMC7998959 DOI: 10.3390/plants10030476] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Revised: 02/20/2021] [Accepted: 02/25/2021] [Indexed: 11/19/2022]
Abstract
Zinc (Zn) is an essential micronutrient for plants and animals, and Zn deficiency is a widespread problem for agricultural production. Although many studies have been performed on biofortification of staple crops with Zn, few studies have focused on forages. Here, the molecular mechanisms of Zn transport in alfalfa (Medicago sativa L.) were investigated following foliar Zn applications. Zinc uptake and redistribution between shoot and root were determined following application of six Zn doses to leaves. Twelve putative genes encoding proteins involved in Zn transport (MsZIP1-7, MsZIF1, MsMTP1, MsYSL1, MsHMA4, and MsNAS1) were identified and changes in their expression following Zn application were quantified using newly designed RT-qPCR assays. These assays are the first designed specifically for alfalfa and resulted in being more efficient than the ones already available for Medicago truncatula (i.e., MtZIP1-7 and MtMTP1). Shoot and root Zn concentration was increased following foliar Zn applications ≥ 0.1 mg plant-1. Increased expression of MsZIP2, MsHMA4, and MsNAS1 in shoots, and of MsZIP2 and MsHMA4 in roots was observed with the largest Zn dose (10 mg Zn plant-1). By contrast, MsZIP3 was downregulated in shoots at Zn doses ≥ 0.1 mg plant-1. Three functional gene modules, involved in Zn uptake by cells, vacuolar Zn sequestration, and Zn redistribution within the plant, were identified. These results will inform genetic engineering strategies aimed at increasing the efficiency of crop Zn biofortification.
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Affiliation(s)
- Alessio Cardini
- Institute of Life Sciences, Scuola Superiore Sant’Anna, 56127 Pisa, Italy; (A.C.); (L.E.)
| | - Elisa Pellegrino
- Institute of Life Sciences, Scuola Superiore Sant’Anna, 56127 Pisa, Italy; (A.C.); (L.E.)
| | - Philip J. White
- Department of Ecological Science, The James Hutton Institute, Invergowrie, Dundee DD2 5DA, UK;
| | - Barbara Mazzolai
- Center for Micro-BioRobotics, Istituto Italiano di Tecnologia, Pontedera, 56025 Pisa, Italy;
| | - Marco C. Mascherpa
- Istituto di Chimica dei Composti Organo Metallici, National Research Council (CNR), 56124 Pisa, Italy;
| | - Laura Ercoli
- Institute of Life Sciences, Scuola Superiore Sant’Anna, 56127 Pisa, Italy; (A.C.); (L.E.)
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Manara A, Fasani E, Furini A, DalCorso G. Evolution of the metal hyperaccumulation and hypertolerance traits. PLANT, CELL & ENVIRONMENT 2020; 43:2969-2986. [PMID: 32520430 DOI: 10.1111/pce.13821] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/19/2020] [Revised: 05/20/2020] [Accepted: 06/05/2020] [Indexed: 05/21/2023]
Abstract
To succeed in life, living organisms have to adapt to the environmental issues to which they are subjected. Some plants, defined as hyperaccumulators, have adapted to metalliferous environments, acquiring the ability to tolerate and accommodate high amounts of toxic metal into their shoot, without showing symptoms of toxicity. The determinants for these traits and their mode of action have long been the subject of research, whose attention lately moved to the evolution of the hypertolerance and hyperaccumulation traits. Genetic evidence indicates that the evolution of both traits includes significant evolutionary events that result in species-wide tolerant and accumulating backgrounds. Different edaphic environments are responsible for subsequent refinement, by local adaptive processes, leading to specific strategies and various degrees of hypertolerance and hyperaccumulation, which characterize metallicolous from non-metallicolous ecotypes belonging to the same genetic unit. In this review, we overview the most updated concepts regarding the evolution of hyperaccumulation and hypertolerance, highlighting also the ecological context concerning the plant populations displaying this fascinating phenomenon.
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Affiliation(s)
- Anna Manara
- Department of Biotechnology, University of Verona, Verona, Italy
| | - Elisa Fasani
- Department of Biotechnology, University of Verona, Verona, Italy
| | - Antonella Furini
- Department of Biotechnology, University of Verona, Verona, Italy
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13
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Ismael MA, Elyamine AM, Moussa MG, Cai M, Zhao X, Hu C. Cadmium in plants: uptake, toxicity, and its interactions with selenium fertilizers. Metallomics 2020; 11:255-277. [PMID: 30632600 DOI: 10.1039/c8mt00247a] [Citation(s) in RCA: 254] [Impact Index Per Article: 63.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Cd is the third major contaminant of greatest hazard to the environment after mercury and lead and is considered as the only metal that poses health risks to both humans and animals at plant tissue concentrations that are generally not phytotoxic. Cd accumulation in plant shoots depends on Cd entry through the roots, sequestration within root vacuoles, translocation in the xylem and phloem, and Cd dilution within the plant shoot throughout its growth. Several metal transporters, processes, and channels are involved from the first step of Cd reaching the root cells and until its final accumulation in the edible parts of the plant. It is hard to demonstrate one step as the pivotal factor to decide the Cd tolerance or accumulation ability of plants since the role of a specific transporter/process varies among plant species and even cultivars. In this review, we discuss the sources of Cd pollutants, Cd toxicity to plants, and mechanisms of Cd uptake and redistribution in plant tissues. The metal transporters involved in Cd transport within plant tissues are also discussed and how their manipulation can control Cd uptake and/or translocation. Finally, we discuss the beneficial effects of Se on plants under Cd stress, and how it can minimize or mitigate Cd toxicity in plants.
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Affiliation(s)
- Marwa A Ismael
- Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River), Ministry of Agriculture, Research Center of Trace Elements, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China.
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14
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Lu Q, Chen S, Li Y, Zheng F, He B, Gu M. Exogenous abscisic acid (ABA) promotes cadmium (Cd) accumulation in Sedum alfredii Hance by regulating the expression of Cd stress response genes. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:8719-8731. [PMID: 31912395 DOI: 10.1007/s11356-019-07512-w] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2019] [Accepted: 12/23/2019] [Indexed: 05/18/2023]
Abstract
Sedum alfredii Hance is a zinc (Zn) and cadmium (Cd) hyperaccumulator plant. However, the regulatory role of plant hormones in the Zn or Cd uptake and accumulation of S. alfredii remains unclear. In this work, the growth, Cd accumulation, abscisic acid (ABA) synthesis and catabolism, malonaldehyde (MDA) content, and transcriptional level of some Cd stress response genes under ABA and Cd co-treatment were investigated to reveal the impact of ABA on Cd resistance and Cd accumulation of S. alfredii. The results show that 0.2 mg/L ABA and 100 μmol/L Cd co-treatment enhanced Cd accumulation and growth in S. alfredii, whereas lower or higher ABA concentrations weaken or even reverse this effect, which was positively correlated with endogenous ABA content. The increase in endogenous ABA content might be the results of the increasing ABA synthetase activities and decreasing ABA lytic enzyme, which was induced by the application of 0.2 mg/L ABA under 100 μmol/L Cd treatment. Principal component analysis (PCA) indicated that ABA impacted the expression pattern of Cd stress response genes, which coincided with the Cd accumulation pattern in the shoots of S. alfredii. Cross-over analysis of partial least squares-discriminant analysis (PLS-DA) and correlation analysis indicated that HsfA4c, HMA4 expression in roots, and HMA2, HMA3, CAD, NAS expression in shoots were correlated with endogenous ABA, which suggests that endogenous ABA improves Cd resistance of seedlings, switches the root-to-shoot transporter from HMA2 to HMA4, and transports more Cd into apoplasts to promote Cd accumulation in the shoots of S. alfredii. Taken together, ABA plays an essential role not only in Cd resistance but also in Cd transport from root to shoot in S. alfredii under Cd stress.
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Affiliation(s)
- Qinyu Lu
- Guangxi Key Laboratory of Agri-environment and Agri-products Safety, Guangxi University, Nanning, 530004, China
- Agricultural College, Guangxi University, Nanning, 530004, China
| | - Shimiao Chen
- Guangxi Key Laboratory of Agri-environment and Agri-products Safety, Guangxi University, Nanning, 530004, China
- Agricultural College, Guangxi University, Nanning, 530004, China
| | - Yanyan Li
- Qinzhou Institute of Agricultural Sciences, Qinzhou, 535000, China
| | - Fuhai Zheng
- Guangzhou Institute of Forestry and Landscape Architecture, Guangzhou, 510405, China
| | - Bing He
- Guangxi Key Laboratory of Agri-environment and Agri-products Safety, Guangxi University, Nanning, 530004, China.
- Agricultural College, Guangxi University, Nanning, 530004, China.
| | - Minghua Gu
- Guangxi Key Laboratory of Agri-environment and Agri-products Safety, Guangxi University, Nanning, 530004, China.
- Agricultural College, Guangxi University, Nanning, 530004, China.
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15
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Corso M, García de la Torre VS. Biomolecular approaches to understanding metal tolerance and hyperaccumulation in plants. Metallomics 2020; 12:840-859. [DOI: 10.1039/d0mt00043d] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Trace metal elements are essential for plant growth but become toxic at high concentrations, while some non-essential elements, such as Cd and As, show toxicity even in traces.
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Affiliation(s)
- Massimiliano Corso
- Institut Jean-Pierre Bourgin
- Université Paris-Saclay
- INRAE
- AgroParisTech
- 78000 Versailles
| | - Vanesa S. García de la Torre
- Molecular Genetics and Physiology of Plants
- Faculty of Biology and Biotechnology
- Ruhr University Bochum
- 44801 Bochum
- Germany
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16
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Nishida S, Tanikawa R, Ishida S, Yoshida J, Mizuno T, Nakanishi H, Furuta N. Elevated Expression of Vacuolar Nickel Transporter Gene IREG2 Is Associated With Reduced Root-to-Shoot Nickel Translocation in Noccaea japonica. FRONTIERS IN PLANT SCIENCE 2020; 11:610. [PMID: 32582232 PMCID: PMC7283525 DOI: 10.3389/fpls.2020.00610] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2020] [Accepted: 04/21/2020] [Indexed: 05/04/2023]
Abstract
A number of metal hyperaccumulator plants, including nickel (Ni) hyperaccumulators, have been identified in the genus Noccaea. The ability to accumulate Ni in shoots varies widely among species and ecotypes in this genus; however, little is known about the molecular mechanisms underlying this intra- and inter-specific variation. Here, in hydroponic culture, we compared Ni accumulation patterns between Noccaea japonica, which originated in Ni-enriched serpentine soils in Mt. Yubari (Hokkaido, Japan), and Noccaea caerulescens ecotype Ganges, which originated in zinc/lead-mine soils in Southern France. Both Noccaea species showed extremely high Ni tolerance compared with that of the non-accumulator Arabidopsis thaliana. But, following treatment with 200 μM Ni, N. caerulescens showed leaf chlorosis, whereas N. japonica did not show any stress symptoms. Shoot Ni concentration was higher in N. caerulescens than in N. japonica; this difference was due to higher efficiency of root-to-shoot Ni translocation in N. caerulescens than N. japonica. It is known that the vacuole Ni transporter IREG2 suppresses Ni translocation from roots to shoots by sequestering Ni in the root vacuoles. The expression level of the IREG2 gene in the roots of N. japonica was 10-fold that in the roots of N. caerulescens. Moreover, the copy number of IREG2 per genome was higher in N. japonica than in N. caerulescens, suggesting that IREG2 expression is elevated by gene multiplication in N. japonica. The heterologous expression of IREG2 of N. japonica and N. caerulescens in yeast and A. thaliana confirmed that both IREG2 genes encode functional vacuole Ni transporters. Taking these results together, we hypothesize that the elevation of IREG2 expression by gene multiplication causes the lower root-to-shoot Ni translocation in N. japonica.
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Affiliation(s)
- Sho Nishida
- Laboratory of Plant Nutrition, Faculty of Agriculture, Saga University, Saga, Japan
- *Correspondence: Sho Nishida,
| | - Ryoji Tanikawa
- Laboratory of Environmental Chemistry, Faculty of Science and Engineering, Chuo University, Tokyo, Japan
| | - Shota Ishida
- Laboratory of Environmental Chemistry, Faculty of Science and Engineering, Chuo University, Tokyo, Japan
| | - Junko Yoshida
- Laboratory of Soil Science and Plant Nutrition, Graduate School of Bioresources, Mie University, Tsu, Japan
| | - Takafumi Mizuno
- Laboratory of Soil Science and Plant Nutrition, Graduate School of Bioresources, Mie University, Tsu, Japan
| | - Hiromi Nakanishi
- Laboratory of Plant Biotechnology, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan
| | - Naoki Furuta
- Laboratory of Environmental Chemistry, Faculty of Science and Engineering, Chuo University, Tokyo, Japan
- Naoki Furuta,
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17
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Borovička J, Konvalinková T, Žigová A, Ďurišová J, Gryndler M, Hršelová H, Kameník J, Leonhardt T, Sácký J. Disentangling the factors of contrasting silver and copper accumulation in sporocarps of the ectomycorrhizal fungus Amanita strobiliformis from two sites. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 694:133679. [PMID: 31400682 DOI: 10.1016/j.scitotenv.2019.133679] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2019] [Revised: 07/29/2019] [Accepted: 07/29/2019] [Indexed: 06/10/2023]
Abstract
Amanita strobiliformis (European Pine Cone Lepidella) is an ectomycorrhizal fungus of the Amanitaceae family known to hyperaccumulate Ag in the sporocarps. Two populations (ecotypes) of A. strobiliformis collected from two urban forest plantations in Prague, Czech Republic, were investigated. The concentrations of Ag, Cu, Cd, and Zn were determined in the mushrooms. The metal mobility and fractionation in the soils was investigated by single extractions and sequential extraction. The soil distribution of A. strobiliformis mycelium was assessed by quantitative polymerase chain reaction (qPCR). The metal uptake from the soil into the mushroom sporocarps was traced by Pb isotopic fingerprinting. The findings suggested that A. strobiliformis (i) accumulates primarily Ag from the topsoil layer (circa 12cm deep) and (ii) accumulates Ag associated with the "reducible soil fraction". The concentrations of all metals, particularly Ag and Cu, were significantly higher in the A. strobiliformis sporocarps from one of the investigated sites (Klíčov). The elevated concentrations of Ag in the sporocarps from Klíčov can possibly be attributed to the higher Ag content in the topsoil layer found at this site. However, the simultaneously elevated concentrations of Cu in A. strobiliformis from Klíčov cannot be explained by the differences in the geochemical background and should be attributed to biological factors.
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Affiliation(s)
- Jan Borovička
- Institute of Geology, Czech Academy of Sciences, Rozvojová 269, 16500 Prague 6, Czech Republic; Nuclear Physics Institute, Czech Academy of Sciences, Hlavní 130, 25068 Husinec-Řež, Czech Republic.
| | - Tereza Konvalinková
- Institute of Microbiology, Czech Academy of Sciences, Vídeňská 1083, 14220 Prague 4, Czech Republic
| | - Anna Žigová
- Institute of Geology, Czech Academy of Sciences, Rozvojová 269, 16500 Prague 6, Czech Republic
| | - Jana Ďurišová
- Institute of Geology, Czech Academy of Sciences, Rozvojová 269, 16500 Prague 6, Czech Republic
| | - Milan Gryndler
- Faculty of Science, Jan Evangelista Purkyně University in Ústí nad Labem, České mládeže 8, 400 96 Ústí nad Labem, Czech Republic
| | - Hana Hršelová
- Institute of Microbiology, Czech Academy of Sciences, Vídeňská 1083, 14220 Prague 4, Czech Republic
| | - Jan Kameník
- Nuclear Physics Institute, Czech Academy of Sciences, Hlavní 130, 25068 Husinec-Řež, Czech Republic
| | - Tereza Leonhardt
- Department of Biochemistry and Microbiology, University of Chemistry and Technology, Prague, Technická 3, 166 28 Prague, Czech Republic
| | - Jan Sácký
- Department of Biochemistry and Microbiology, University of Chemistry and Technology, Prague, Technická 3, 166 28 Prague, Czech Republic
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18
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Li C, Ji X, Luo X. Phytoremediation of Heavy Metal Pollution: A Bibliometric and Scientometric Analysis from 1989 to 2018. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2019; 16:ijerph16234755. [PMID: 31783655 PMCID: PMC6926625 DOI: 10.3390/ijerph16234755] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/19/2019] [Revised: 11/22/2019] [Accepted: 11/23/2019] [Indexed: 12/18/2022]
Abstract
This paper aims to evaluate the knowledge landscape of the phytoremediation of heavy metals (HMs) by constructing a series of scientific maps and exploring the research hotspots and trends of this field. This study presents a review of 6873 documents published about phytoremediation of HMs in the international context from the Web of Science Core Collection (WoSCC) (1989–2018). Two different processing software applications were used, CiteSpace and Bibliometrix. This research field is characterized by high interdisciplinarity and a rapid increase in the subject categories of engineering applications. The basic supporting categories mainly included “Environmental Sciences & Ecology”, “Plant Sciences”, and “Agriculture”. In addition, there has been a trend in recent years to focus on categories such as “Engineering, Multidisciplinary”, “Engineering, Chemical”, and “Green & Sustainable Science & Technology”. “Soil”, “hyperaccumulator”, “enrichment mechanism/process”, and “enhance technology” were found to be the main research hotspots. “Wastewater”, “field crops”, “genetically engineered microbes/plants”, and “agromining” may be the main research trends. Bibliometric and scientometric analysis are useful methods to qualitatively and quantitatively measure research hotspots and trends in phytoremediation of HM, and can be widely used to help new researchers to review the available research in a certain research field.
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Affiliation(s)
- Chen Li
- School of Chemistry and Environmental Science, Shaanxi University of Technology, Hanzhong 723001, China; (C.L.); (X.J.)
- School of Environment and Resource, Southwest University of Science and Technology, Mianyang 621010, China
- Shaanxi Key Laboratory of Catalysis, Shaanxi University of Technology, Hanzhong 723001, China
- School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China
| | - Xiaohui Ji
- School of Chemistry and Environmental Science, Shaanxi University of Technology, Hanzhong 723001, China; (C.L.); (X.J.)
- School of Environment and Resource, Southwest University of Science and Technology, Mianyang 621010, China
- Shaanxi Key Laboratory of Catalysis, Shaanxi University of Technology, Hanzhong 723001, China
- School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China
| | - Xuegang Luo
- School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China
- Correspondence:
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19
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Wu Y, Li X, Chen D, Han X, Li B, Yang Y, Yang Y. Comparative expression analysis of heavy metal ATPase subfamily genes between Cd-tolerant and Cd-sensitive turnip landraces. PLANT DIVERSITY 2019; 41:275-283. [PMID: 31528787 PMCID: PMC6742492 DOI: 10.1016/j.pld.2019.02.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2018] [Revised: 01/30/2019] [Accepted: 02/25/2019] [Indexed: 05/25/2023]
Abstract
The heavy metal ATPase (HMA) subfamily is mainly involved in heavy metal (HM) tolerance and transport in plants, but an understanding of the definite roles and mechanisms of most HMA members are still limited. In the present study, we identified 14 candidate HMA genes named BrrHMA1-BrrHMA8 from the turnip genome and analyzed the phylogeny, gene structure, chromosome distribution, and conserved domains and motifs of HMAs in turnip (Brassica rapa var. rapa). According to our phylogenetic tree, the BrrHMAs are divided into a Zn/Cd/Co/Pb subclass and Cu/Ag subclass. The BrrHMA members show similar structural characteristics within subclasses. To explore the roles of BrrHMAs in turnip, we compared the gene sequences and expression patterns of the BrrHMA genes between a Cd-tolerant landrace and a Cd-sensitive landrace. Most BrrHMA genes showed similar spatial expression patterns in both Cd-tolerant and Cd-sensitive turnip landraces; some BrrHMA genes, however, were differentially expressed in specific tissue in Cd-tolerant and Cd-sensitive turnip. Specifically, BrrHMA genes in the Zn/Cd/Co/Pb subclass shared the same coding sequence but were differentially expressed in Cd-tolerant and Cd-sensitive turnip landraces under Cd stress. Our findings suggest that the stable expression and up-regulated expression of BrrHMA Zn/Cd/Co/Pb subclass genes under Cd stress may contribute to the higher Cd tolerance of turnip landraces.
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Affiliation(s)
- Yuansheng Wu
- China Germplasm Bank of Wild Species, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China
- College of Plant Protection, Yunnan Agricultural University, Kunming 650201, China
| | - Xiong Li
- China Germplasm Bank of Wild Species, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China
- Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China
| | - Di Chen
- China Germplasm Bank of Wild Species, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China
- School of Life Sciences, Yunnan University, Kunming 650091, China
| | - Xi Han
- College of Plant Protection, Yunnan Agricultural University, Kunming 650201, China
| | - Boqun Li
- China Germplasm Bank of Wild Species, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China
- Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China
| | - Yonghong Yang
- College of Plant Protection, Yunnan Agricultural University, Kunming 650201, China
| | - Yongping Yang
- China Germplasm Bank of Wild Species, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China
- Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China
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20
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van der Pas L, Ingle RA. Towards an Understanding of the Molecular Basis of Nickel Hyperaccumulation in Plants. PLANTS (BASEL, SWITZERLAND) 2019; 8:E11. [PMID: 30621231 PMCID: PMC6359332 DOI: 10.3390/plants8010011] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/06/2018] [Revised: 12/28/2018] [Accepted: 12/31/2018] [Indexed: 12/19/2022]
Abstract
Metal hyperaccumulation is a rare and fascinating phenomenon, whereby plants actively accumulate high concentrations of metal ions in their above-ground tissues. Enhanced uptake and root-to-shoot translocation of specific metal ions coupled with an increased capacity for detoxification and sequestration of these ions are thought to constitute the physiological basis of the hyperaccumulation phenotype. Nickel hyperaccumulators were the first to be discovered and are the most numerous, accounting for some seventy-five percent of all known hyperaccumulators. However, our understanding of the molecular basis of the physiological processes underpinning Ni hyperaccumulation has lagged behind that of Zn and Cd hyperaccumulation, in large part due to a lack of genomic resources for Ni hyperaccumulators. The advent of RNA-Seq technology, which allows both transcriptome assembly and profiling of global gene expression without the need for a reference genome, has offered a new route for the analysis of Ni hyperaccumulators, and several such studies have recently been reported. Here we review the current state of our understanding of the molecular basis of Ni hyperaccumulation in plants, with an emphasis on insights gained from recent RNA-Seq experiments, highlight commonalities and differences between Ni hyperaccumulators, and suggest potential future avenues of research in this field.
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Affiliation(s)
- Llewelyn van der Pas
- Department of Molecular and Cell Biology, University of Cape Town, Rondebosch 7701, South Africa.
| | - Robert A Ingle
- Department of Molecular and Cell Biology, University of Cape Town, Rondebosch 7701, South Africa.
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21
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Lekeux G, Crowet JM, Nouet C, Joris M, Jadoul A, Bosman B, Carnol M, Motte P, Lins L, Galleni M, Hanikenne M. Homology modeling and in vivo functional characterization of the zinc permeation pathway in a heavy metal P-type ATPase. JOURNAL OF EXPERIMENTAL BOTANY 2019; 70:329-341. [PMID: 30418580 PMCID: PMC6305203 DOI: 10.1093/jxb/ery353] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2018] [Accepted: 10/01/2018] [Indexed: 05/26/2023]
Abstract
The P1B ATPase heavy metal ATPase 4 (HMA4) is responsible for zinc and cadmium translocation from roots to shoots in Arabidopsis thaliana. It couples ATP hydrolysis to cytosolic domain movements, enabling metal transport across the membrane. The detailed mechanism of metal permeation by HMA4 through the membrane remains elusive. Here, homology modeling of the HMA4 transmembrane region was conducted based on the crystal structure of a ZntA bacterial homolog. The analysis highlighted amino acids forming a metal permeation pathway, whose importance was subsequently investigated functionally through mutagenesis and complementation experiments in plants. Although the zinc pathway displayed overall conservation among the two proteins, significant differences were observed, especially in the entrance area with altered electronegativity and the presence of a ionic interaction/hydrogen bond network. The analysis also newly identified amino acids whose mutation results in total or partial loss of the protein function. In addition, comparison of zinc and cadmium accumulation in shoots of A. thaliana complemented lines revealed a number of HMA4 mutants exhibiting different abilities in zinc and cadmium translocation. These observations could be instrumental to design low cadmium-accumulating crops, hence decreasing human cadmium exposure.
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Affiliation(s)
- Gilles Lekeux
- InBioS - Center for Protein Engineering (CIP), Biological Macromolecules, University of Liège, Liège, Belgium
- InBioS - PhytoSystems, Functional Genomics and Plant Molecular Imaging, University of Liège, Liège, Belgium
| | - Jean-Marc Crowet
- Laboratory of Molecular Biophysics at Interfaces, Gembloux Agro-Bio Tech, University of Liège, Gembloux, Belgium
| | - Cécile Nouet
- InBioS - PhytoSystems, Functional Genomics and Plant Molecular Imaging, University of Liège, Liège, Belgium
| | - Marine Joris
- InBioS - PhytoSystems, Functional Genomics and Plant Molecular Imaging, University of Liège, Liège, Belgium
| | - Alice Jadoul
- InBioS - PhytoSystems, Functional Genomics and Plant Molecular Imaging, University of Liège, Liège, Belgium
| | - Bernard Bosman
- InBioS - PhytoSystems, Laboratory of Plant and Microbial Ecology, Department of Biology, Ecology, Evolution, University of Liège, Liège, Belgium
| | - Monique Carnol
- InBioS - PhytoSystems, Laboratory of Plant and Microbial Ecology, Department of Biology, Ecology, Evolution, University of Liège, Liège, Belgium
| | - Patrick Motte
- InBioS - PhytoSystems, Functional Genomics and Plant Molecular Imaging, University of Liège, Liège, Belgium
| | - Laurence Lins
- Laboratory of Molecular Biophysics at Interfaces, Gembloux Agro-Bio Tech, University of Liège, Gembloux, Belgium
| | - Moreno Galleni
- InBioS - Center for Protein Engineering (CIP), Biological Macromolecules, University of Liège, Liège, Belgium
| | - Marc Hanikenne
- InBioS - PhytoSystems, Functional Genomics and Plant Molecular Imaging, University of Liège, Liège, Belgium
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22
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Halimaa P, Blande D, Baltzi E, Aarts MGM, Granlund L, Keinänen M, Kärenlampi SO, Kozhevnikova AD, Peräniemi S, Schat H, Seregin IV, Tuomainen M, Tervahauta AI. Transcriptional effects of cadmium on iron homeostasis differ in calamine accessions of Noccaea caerulescens. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2019; 97:306-320. [PMID: 30288820 DOI: 10.1111/tpj.14121] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2017] [Revised: 09/20/2018] [Accepted: 09/24/2018] [Indexed: 05/26/2023]
Abstract
Calamine accessions of the zinc/cadmium/nickel hyperaccumulator, Noccaea caerulescens, exhibit striking variation in foliar cadmium accumulation in nature. The Ganges accession (GA) from Southern France displays foliar cadmium hyperaccumulation (>1000 μg g-1 DW), whereas the accession La Calamine (LC) from Belgium, with similar local soil metal composition, does not (<100 μg g-1 DW). All calamine accessions are cadmium hypertolerant. To find out the differences between LC and GA in their basic adaptation mechanisms, we bypassed the cadmium excluding phenotype of LC by exposing the plants to 50 μm cadmium in hydroponics, achieving equal cadmium accumulation in the shoots. The iron content increased in the roots of both accessions. GA exhibited significant decreases in manganese and zinc contents in the roots and shoots, approaching those in LC. Altogether 702 genes responded differently to cadmium exposure between the accessions, 157 and 545 in the roots and shoots, respectively. Cadmium-exposed LC showed a stress response and had decreased levels of a wide range of photosynthesis-related transcripts. GA showed less changes, mainly exhibiting an iron deficiency-like response. This included increased expression of genes encoding five iron deficiency-regulated bHLH transcription factors, ferric reduction oxidase FRO2, iron transporters IRT1 and OPT3, and nicotianamine synthase NAS1, and decreased expression of genes encoding ferritins and NEET (a NEET family iron-sulfur protein), which is possibly involved in iron transfer, distribution and/or management. The function of the IRT1 gene in the accessions was compared. We conclude that the major difference between the two accessions is in the way they cope with iron under cadmium exposure.
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Affiliation(s)
- Pauliina Halimaa
- Department of Environmental and Biological Sciences, University of Eastern Finland, P.O. Box 1627, 70210, Kuopio, Finland
| | - Daniel Blande
- Department of Environmental and Biological Sciences, University of Eastern Finland, P.O. Box 1627, 70210, Kuopio, Finland
| | - Erol Baltzi
- Department of Environmental and Biological Sciences, University of Eastern Finland, P.O. Box 1627, 70210, Kuopio, Finland
| | - Mark G M Aarts
- Laboratory of Genetics, Wageningen University and Research, P.O. Box 16, 6700 AH, Wageningen, The Netherlands
| | - Lars Granlund
- Department of Environmental and Biological Sciences, University of Eastern Finland, P.O. Box 1627, 70210, Kuopio, Finland
| | - Markku Keinänen
- Department of Environmental and Biological Sciences, University of Eastern Finland, P.O. Box 1627, 70210, Kuopio, Finland
| | - Sirpa O Kärenlampi
- Department of Environmental and Biological Sciences, University of Eastern Finland, P.O. Box 1627, 70210, Kuopio, Finland
| | - Anna D Kozhevnikova
- Timiryazev Institute of Plant Physiology, Russian Academy of Sciences, ul. Botanicheskaya 35, Moscow, 127276, Russia
| | - Sirpa Peräniemi
- School of Pharmacy, University of Eastern Finland, P.O. Box 1627, 70210, Kuopio, Finland
| | - Henk Schat
- Laboratory of Genetics, Wageningen University and Research, P.O. Box 16, 6700 AH, Wageningen, The Netherlands
- Institute of Ecological Science, Vrije Universiteit Amsterdam, De Boelelaan 1085, 1081 HV, Amsterdam, The Netherlands
| | - Ilya V Seregin
- Timiryazev Institute of Plant Physiology, Russian Academy of Sciences, ul. Botanicheskaya 35, Moscow, 127276, Russia
| | - Marjo Tuomainen
- Department of Environmental and Biological Sciences, University of Eastern Finland, P.O. Box 1627, 70210, Kuopio, Finland
| | - Arja I Tervahauta
- Department of Environmental and Biological Sciences, University of Eastern Finland, P.O. Box 1627, 70210, Kuopio, Finland
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Cheng D, Tan M, Yu H, Li L, Zhu D, Chen Y, Jiang M. Comparative analysis of Cd-responsive maize and rice transcriptomes highlights Cd co-modulated orthologs. BMC Genomics 2018; 19:709. [PMID: 30257650 PMCID: PMC6158873 DOI: 10.1186/s12864-018-5109-8] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2018] [Accepted: 09/21/2018] [Indexed: 11/29/2022] Open
Abstract
Background Metal tolerance is often an integrative result of metal uptake and distribution, which are fine-tuned by a network of signaling cascades and metal transporters. Thus, with the goal of advancing the molecular understanding of such metal homeostatic mechanisms, comparative RNAseq-based transcriptome analysis was conducted to dissect differentially expressed genes (DEGs) in maize roots exposed to cadmium (Cd) stress. Results To unveil conserved Cd-responsive genes in cereal plants, the obtained 5166 maize DEGs were compared with 2567 Cd-regulated orthologs in rice roots, and this comparison generated 880 universal Cd-responsive orthologs groups composed of 1074 maize DEGs and 981 rice counterparts. More importantly, most of the orthologous DEGs showed coordinated expression pattern between Cd-treated maize and rice, and these include one large orthologs group of pleiotropic drug resistance (PDR)-type ABC transporters, two clusters of amino acid transporters, and 3 blocks of multidrug and toxic compound extrusion (MATE) efflux family transporters, and 3 clusters of heavy metal-associated domain (HMAD) isoprenylated plant proteins (HIPPs), as well as all 4 groups of zinc/iron regulated transporter protein (ZIPs). Additionally, several blocks of tandem maize paralogs, such as germin-like proteins (GLPs), phenylalanine ammonia-lyases (PALs) and several enzymes involved in JA biosynthesis, displayed consistent co-expression pattern under Cd stress. Out of the 1074 maize DEGs, approximately 30 maize Cd-responsive genes such as ZmHIPP27, stress-responsive NAC transcription factor (ZmSNAC1) and 9-cis-epoxycarotenoid dioxygenase (NCED, vp14) were also common stress-responsive genes reported to be uniformly regulated by multiple abiotic stresses. Moreover, the aforementioned three promising Cd-upregulated genes with rice counterparts were identified to be novel Cd-responsive genes in maize. Meanwhile, one maize glutamate decarboxylase (ZmGAD1) with Cd co-modulated rice ortholog was selected for further analysis of Cd tolerance via heterologous expression, and the results suggest that ZmGAD1 can confer Cd tolerance in yeast and tobacco leaves. Conclusions These novel findings revealed the conserved function of Cd-responsive orthologs and paralogs, which would be valuable for elucidating the genetic basis of the plant response to Cd stress and unraveling Cd tolerance genes. Electronic supplementary material The online version of this article (10.1186/s12864-018-5109-8) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Dan Cheng
- National Key Laboratory of Crop Genetics and Germplasm Enhancement, College of Life Sciences, Nanjing Agricultural University, Nanjing, China
| | - Mingpu Tan
- National Key Laboratory of Crop Genetics and Germplasm Enhancement, College of Life Sciences, Nanjing Agricultural University, Nanjing, China.
| | - Haijuan Yu
- National Key Laboratory of Crop Genetics and Germplasm Enhancement, College of Life Sciences, Nanjing Agricultural University, Nanjing, China
| | - Liang Li
- National Key Laboratory of Crop Genetics and Germplasm Enhancement, College of Life Sciences, Nanjing Agricultural University, Nanjing, China
| | - Dandan Zhu
- National Key Laboratory of Crop Genetics and Germplasm Enhancement, College of Life Sciences, Nanjing Agricultural University, Nanjing, China
| | - Yahua Chen
- National Key Laboratory of Crop Genetics and Germplasm Enhancement, College of Life Sciences, Nanjing Agricultural University, Nanjing, China
| | - Mingyi Jiang
- National Key Laboratory of Crop Genetics and Germplasm Enhancement, College of Life Sciences, Nanjing Agricultural University, Nanjing, China
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24
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Meier SK, Adams N, Wolf M, Balkwill K, Muasya AM, Gehring CA, Bishop JM, Ingle RA. Comparative RNA-seq analysis of nickel hyperaccumulating and non-accumulating populations of Senecio coronatus (Asteraceae). THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2018; 95:1023-1038. [PMID: 29952120 DOI: 10.1111/tpj.14008] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2017] [Accepted: 06/20/2018] [Indexed: 06/08/2023]
Abstract
Most metal hyperaccumulating plants accumulate nickel, yet the molecular basis of Ni hyperaccumulation is not well understood. We chose Senecio coronatus to investigate this phenomenon as this species displays marked variation in shoot Ni content across ultramafic outcrops in the Barberton Greenstone Belt (South Africa), thus allowing an intraspecific comparative approach to be employed. No correlation between soil and shoot Ni contents was observed, suggesting that this variation has a genetic rather than environmental basis. This was confirmed by our observation that the accumulation phenotype of plants from two hyperaccumulator and two non-accumulator populations was maintained when the plants were grown on a soil mix from these four sites for 12 months. We analysed the genetic variation among 12 serpentine populations of S. coronatus, and used RNA-seq for de novo transcriptome assembly and analysis of gene expression in hyperaccumulator versus non-accumulator populations. Genetic analysis revealed the presence of hyperaccumulators in two well supported evolutionary lineages, indicating that Ni hyperaccumulation may have evolved more than once in this species. RNA-Seq analysis indicated that putative homologues of transporters associated with root iron uptake in plants are expressed at elevated levels in roots and shoots of hyperaccumulating populations of S. coronatus from both evolutionary lineages. We hypothesise that Ni hyperaccumulation in S. coronatus may have evolved through recruitment of these transporters, which play a role in the iron-deficiency response in other plant species.
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Affiliation(s)
- Stuart K Meier
- Division of Biological and Environmental Science and Engineering, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Saudi Arabia
| | - Nicolette Adams
- Department of Molecular and Cell Biology, University of Cape Town, Rondebosch, 7700, South Africa
| | - Michael Wolf
- Department of Molecular and Cell Biology, University of Cape Town, Rondebosch, 7700, South Africa
| | - Kevin Balkwill
- School of Animal, Plant and Environmental Sciences, University of the Witwatersrand, Johannesburg, 2050, South Africa
| | - Abraham Muthama Muasya
- Department of Biological Sciences, University of Cape Town, Rondebosch, 7700, South Africa
| | - Christoph A Gehring
- Division of Biological and Environmental Science and Engineering, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Saudi Arabia
| | - Jacqueline M Bishop
- Department of Biological Sciences, University of Cape Town, Rondebosch, 7700, South Africa
| | - Robert A Ingle
- Department of Molecular and Cell Biology, University of Cape Town, Rondebosch, 7700, South Africa
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25
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Zhang H, Ding Y, Zhi J, Li X, Liu H, Xu J. Over-expression of the poplar expansin gene PtoEXPA12 in tobacco plants enhanced cadmium accumulation. Int J Biol Macromol 2018; 116:676-682. [PMID: 29758311 DOI: 10.1016/j.ijbiomac.2018.05.053] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2018] [Revised: 05/10/2018] [Accepted: 05/10/2018] [Indexed: 12/30/2022]
Abstract
As important cell wall proteins in plants, expansins are involved in a serious of abiotic stress resistance such as drought, heat, salt, even heavy metals. To understand the role of expansins in cadmium (Cd) stress, we analyzed the expression patterns of 36 expansin genes in Populus tomentosa. A Cd-induced expansin gene, PtoEXPA12, was identified, cloned, and transformed into tobacco plants. After treatment with Cd, the transgenic plants showed stronger symptoms of Cd toxicity as to the wild-type tobacco plants. Further physiological tests showed that the transformants had higher relative electrolyte leakage and superoxide dismutase activity, more malondialdehyde and H2O2 content, and lower chlorophyll content in Cd stress. Cd content measurement showed it is 1.40-2.07-fold higher and 1.29-1.38-fold higher separately in roots and shoots of transgenic plants than those in wild-type plants, while the transfer coefficient value kept invariably even decreased. Therefore, PtoEXPA12 was really involved in Cd uptake and accumulation, and led to Cd toxicity of cells. It would be a potentially applicable part in phytoremediation system.
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Affiliation(s)
- Hao Zhang
- National Engineering Laboratory of Tree Breeding, Beijing Forestry University, 100083, China
| | - Yana Ding
- National Engineering Laboratory of Tree Breeding, Beijing Forestry University, 100083, China
| | - Junkai Zhi
- National Engineering Laboratory of Tree Breeding, Beijing Forestry University, 100083, China
| | - Xiaoyu Li
- National Engineering Laboratory of Tree Breeding, Beijing Forestry University, 100083, China
| | - Huabo Liu
- National Engineering Laboratory of Tree Breeding, Beijing Forestry University, 100083, China
| | - Jichen Xu
- National Engineering Laboratory of Tree Breeding, Beijing Forestry University, 100083, China.
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26
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Lima LW, Pilon-Smits EAH, Schiavon M. Mechanisms of selenium hyperaccumulation in plants: A survey of molecular, biochemical and ecological cues. Biochim Biophys Acta Gen Subj 2018; 1862:2343-2353. [PMID: 29626605 DOI: 10.1016/j.bbagen.2018.03.028] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2018] [Revised: 03/20/2018] [Accepted: 03/25/2018] [Indexed: 12/01/2022]
Abstract
BACKGROUND Selenium (Se) is a micronutrient required for many life forms, but toxic at higher concentration. Plants do not have a Se requirement, but can benefit from Se via enhanced antioxidant activity. Some plant species can accumulate Se to concentrations above 0.1% of dry weight and seem to possess mechanisms that distinguish Se from its analog sulfur (S). Research on these so-called Se hyperaccumulators aims to identify key genes for this remarkable trait and to understand ecological implications. SCOPE OF REVIEW This review gives a broad overview of the current knowledge about Se uptake and metabolism in plants, with a special emphasis on hypothesized mechanisms of Se hyperaccumulation. The role of Se in plant defense responses and the associated ecological implications are discussed. MAJOR CONCLUSIONS Hyperaccumulators have enhanced expression of S transport and assimilation genes, and may possess transporters with higher specificity for selenate over sulfate. Genes involved in antioxidant reactions and biotic stress resistance are also upregulated. Key regulators in these processes appear to be the growth regulators jasmonic acid, salicylic acid and ethylene. Hyperaccumulation may have evolved owing to associated ecological benefits, particularly protection against pathogens and herbivores, and as a form of elemental allelopathy. GENERAL SIGNIFICANCE Understanding plant Se uptake and metabolism in hyperaccumulators has broad relevance for the environment, agriculture and human and animal nutrition and may help generate crops with selenate-specific uptake and high capacity to convert selenate to less toxic, anticarcinogenic, organic Se compounds.
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Affiliation(s)
| | | | - Michela Schiavon
- DAFNAE, University of Padova, Agripolis, 35020 Legnaro, PD, Italy.
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27
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Jaffré T, Reeves RD, Baker AJM, Schat H, van der Ent A. The discovery of nickel hyperaccumulation in the New Caledonian tree Pycnandra acuminata 40 years on: an introduction to a Virtual Issue. THE NEW PHYTOLOGIST 2018; 218:397-400. [PMID: 29561072 DOI: 10.1111/nph.15105] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Affiliation(s)
- Tanguy Jaffré
- Institut de Recherche pour le Développement (IRD), UMR AMAP, Herbarium NOU, Nouméa, 98848, New Caledonia
| | | | - Alan J M Baker
- Centre for Mined Land Rehabilitation, The University of Queensland, St Lucia, Queensland, 4072, Australia
- Laboratoire Sols et Environnement, Université de Lorraine/INRA, Vandoeuvre-lès-Nancy, France
| | - Henk Schat
- Department of Ecological Sciences, Faculty of Earth and Life Sciences, Vrije Universiteit Amsterdam, Amsterdam, the Netherlands
- Laboratory of Genetics, Wageningen University, Wageningen, the Netherlands
| | - Antony van der Ent
- Centre for Mined Land Rehabilitation, The University of Queensland, St Lucia, Queensland, 4072, Australia
- Laboratoire Sols et Environnement, Université de Lorraine/INRA, Vandoeuvre-lès-Nancy, France
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28
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Krämer U. Conceptualizing plant systems evolution. CURRENT OPINION IN PLANT BIOLOGY 2018; 42:66-75. [PMID: 29579731 DOI: 10.1016/j.pbi.2018.02.008] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2017] [Revised: 02/22/2018] [Accepted: 02/26/2018] [Indexed: 06/08/2023]
Abstract
Organisms inhabiting extreme environments are emerging models in systems evolution, enabling us to identify the molecular alterations effecting major phenotypic divergence through comparative approaches. Here I discuss possible physiological mechanisms underlying evolutionary adaptations to extreme environments both theoretically and in relation to experimental observations. Reasoning leads me to the 'conserved steady-state' hypothesis of evolutionary adaptation: Between closely related plants adapted to differently composed soils, the homeostatically controlled steady-state set point cytosolic (buffered) concentrations of mineral ions are conserved. Subsequently, I compare molecular alterations expected to contribute to physiological adaptations with our present knowledge. Key roles of enhanced gene product dosage in plant evolutionary adaptations question the widespread stimulus response-centric paradigm. As a broader implication, co-regulation networks can lack decisive functional network elements. With this article, I hope to stimulate a discussion across research fields and provide an initial conceptual framework for future experimental testing and for quantitative modelling.
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Affiliation(s)
- Ute Krämer
- Molecular Genetics and Physiology of Plants, Ruhr University Bochum, Universitätsstraße 150, ND3/30, D-44801 Bochum, Germany.
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29
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McGladdery C, Weindorf DC, Chakraborty S, Li B, Paulette L, Podar D, Pearson D, Kusi NYO, Duda B. Elemental assessment of vegetation via portable X-ray fluorescence (PXRF) spectrometry. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2018; 210:210-225. [PMID: 29348058 DOI: 10.1016/j.jenvman.2018.01.003] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/23/2017] [Revised: 12/28/2017] [Accepted: 01/01/2018] [Indexed: 06/07/2023]
Abstract
Elemental concentrations in vegetation are of critical importance, whether establishing plant essential element concentrations (toxicity vs. deficiency) or investigating deleterious elements (e.g., heavy metals) differentially extracted from the soil by plants. Traditionally, elemental analysis of vegetation has been facilitated by acid digestion followed by quantification via inductively coupled plasma (ICP) or atomic absorption (AA) spectroscopy. Previous studies have utilized portable X-ray fluorescence (PXRF) spectroscopy to quantify elements in soils, but few have evaluated the vegetation. In this study, a PXRF spectrometer was employed to scan 228 organic material samples (thatch, deciduous leaves, grasses, tree bark, and herbaceous plants) from smelter-impacted areas of Romania, as well as National Institute of Standards and Technology (NIST) certified reference materials, to demonstrate the application of PXRF for elemental determination in vegetation. Samples were scanned in three conditions: as received from the field (moist), oven dry (70 °C), and dried and powdered to pass a 2 mm sieve. Performance metrics of PXRF models relative to ICP atomic emission spectroscopy were developed to asses optimal scanning conditions. Thatch and bark samples showed the highest mean PXRF and ICP concentrations (e.g., Zn, Pb, Cd, Fe), with the exceptions of K and Cl. Validation statistics indicate that the stable validation predictive capacity of PXRF increased in the following order: oven dry intact < field moist < oven dried and powdered. Even under field moist conditions, PXRF could reasonably be used for the determination of Zn (coefficient of determination, R2val 0.86; residual prediction deviation, RPD 2.72) and Cu (R2val 0.77; RPD 2.12), while dried and powdered samples allowed for stable validation prediction of Pb (R2val 0.90; RPD 3.29), Fe (R2val 0.80; RPD 2.29), Cd (R2val 0.75; RPD 2.07) and Cu (R2val 0.98; RPD of 8.53). Summarily, PXRF was shown to be a useful approach for quickly assessing the elemental concentration in vegetation. Future PXRF/vegetation research should explore additional elements and investigate its usefulness in evaluating phytoremediation effectiveness.
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Affiliation(s)
- Candice McGladdery
- Department of Plant and Soil Science, University of Pretoria, Pretoria, South Africa
| | - David C Weindorf
- Department of Plant and Soil Science, Texas Tech University, Lubbock, TX, USA.
| | | | - Bin Li
- Department of Experimental Statistics, Louisiana State University, Baton Rouge, LA, USA
| | - Laura Paulette
- Department of Technical and Soil Sciences, University of Agricultural Sciences and Veterinary Medicine, Cluj-Napoca, Romania
| | - Dorina Podar
- Department of Molecular Biology and Biotechnology, Babeş-Bolyai University, Cluj-Napoca, Romania
| | - Delaina Pearson
- Department of Plant and Soil Science, Texas Tech University, Lubbock, TX, USA
| | - Nana Yaw O Kusi
- Department of Plant and Soil Science, Texas Tech University, Lubbock, TX, USA
| | - Bogdan Duda
- Department of Plant and Soil Science, Texas Tech University, Lubbock, TX, USA
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30
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Merlot S, Sanchez Garcia de la Torre V, Hanikenne M. Physiology and Molecular Biology of Trace Element Hyperaccumulation. AGROMINING: FARMING FOR METALS 2018. [DOI: 10.1007/978-3-319-61899-9_6] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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31
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El Mehdawi AF, Jiang Y, Guignardi ZS, Esmat A, Pilon M, Pilon-Smits EAH, Schiavon M. Influence of sulfate supply on selenium uptake dynamics and expression of sulfate/selenate transporters in selenium hyperaccumulator and nonhyperaccumulator Brassicaceae. THE NEW PHYTOLOGIST 2018; 217:194-205. [PMID: 29034966 DOI: 10.1111/nph.14838] [Citation(s) in RCA: 60] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2017] [Accepted: 09/08/2017] [Indexed: 05/21/2023]
Abstract
Stanleya pinnata not only hyperaccumulates selenium (Se) to 0.5% of its dry weight, but also exhibits higher tissue Se-to-sulfur (S) ratios than other species and its surroundings. To investigate the mechanisms underlying this Se enrichment, we compared S. pinnata with the nonhyperaccumulators S. elata and Brassica juncea for selenate uptake in long- (9 d) and short-term (1 h) assays, using different concentrations of selenate and competitor sulfate. Different sulfate pre-treatments (0, 0.5, 5 mM, 3 d) were also tested for effects on selenate uptake and sulfate transporters' expression. Relative to nonhyperaccumulators, S. pinnata showed higher rates of root and shoot Se accumulation and less competitive inhibition by sulfate or by high-S pretreatment. The selenate uptake rate for S. pinnata (1 h) was three- to four-fold higher than for nonhyperaccumulators, and not significantly affected by 100-fold excess sulfate, which reduced selenate uptake by 100% in S. elata and 40% in B. juncea. Real-time reverse transcription PCR indicated constitutive upregulation in S. pinnata of sulfate transporters SULTR1;2 (root influx) and SULTR2;1 (translocation), but reduced SULTR1;1 expression (root influx). In S. pinnata, selenate uptake and translocation rates are constitutively elevated and relatively sulfate-independent. Underlying mechanisms likely include overexpression of SULTR1;2 and SULTR2;1, which may additionally have evolved enhanced specificity for selenate over sulfate.
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Affiliation(s)
- Ali F El Mehdawi
- Biology Department, Colorado State University, Fort Collins, CO, 80523, USA
| | - Ying Jiang
- Biology Department, Colorado State University, Fort Collins, CO, 80523, USA
- College of Agronomy and Biotechnology, China Agricultural University, Beijing, 100193, China
| | - Zack S Guignardi
- Biology Department, Colorado State University, Fort Collins, CO, 80523, USA
| | - Ahmad Esmat
- Biology Department, Colorado State University, Fort Collins, CO, 80523, USA
| | - Marinus Pilon
- Biology Department, Colorado State University, Fort Collins, CO, 80523, USA
| | | | - Michela Schiavon
- Biology Department, Colorado State University, Fort Collins, CO, 80523, USA
- DAFNAE, University of Padova, Agripolis, 35020, Legnaro, Padua, Italy
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32
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Chen Y, Zhi J, Zhang H, Li J, Zhao Q, Xu J. Transcriptome analysis of Phytolacca americana L. in response to cadmium stress. PLoS One 2017; 12:e0184681. [PMID: 28898278 PMCID: PMC5595333 DOI: 10.1371/journal.pone.0184681] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2017] [Accepted: 08/29/2017] [Indexed: 11/18/2022] Open
Abstract
Phytolacca americana L. (pokeweed) has metal phytoremediation potential, but little is known about its metal accumulation-related genes. In this study, the de novo sequencing of total RNA produced 53.15 million reads covering 10.63 gigabases of transcriptome raw data in cadmium (Cd)-treated and untreated pokeweed. Of the 97,502 assembled unigenes, 42,197 had significant matches in a public database and were annotated accordingly. An expression level comparison between the samples revealed 1515 differentially expressed genes (DEGs), 923 down- and 592 up-regulated under Cd treatment. A KEGG pathway enrichment analysis of DEGs revealed that they were involved in 72 metabolism pathways, with photosynthesis, phenylalanine metabolism, ribosome, phenylpropanoid biosynthesis, flavonoid biosynthesis and carbon fixation in photosynthetic organisms containing 24, 18, 72, 14, 7 and 15 genes, respectively. Genes related to heavy metal tolerance, absorption, transport and accumulation were also identified, including 11 expansins, 8 nicotianamine synthases, 6 aquaporins, 4 ZRT/IRT-like proteins, 3 ABC transporters and 3 metallothioneins. The gene expression results of 12 randomly selected DEGs were validated using quantitative real-time PCR, and showed different response patterns to Cd in their roots, stems and leaves. These results may be helpful in increasing our understanding of heavy metal hyperaccumulators and in future phytoremediation applications.
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Affiliation(s)
- Yongkun Chen
- National Engineering Laboratory for Tree Breeding, Beijing Forestry University, Beijing, China
| | - Junkai Zhi
- National Engineering Laboratory for Tree Breeding, Beijing Forestry University, Beijing, China
| | - Hao Zhang
- National Engineering Laboratory for Tree Breeding, Beijing Forestry University, Beijing, China
| | - Jian Li
- National Engineering Laboratory for Tree Breeding, Beijing Forestry University, Beijing, China
| | - Qihong Zhao
- National Engineering Laboratory for Tree Breeding, Beijing Forestry University, Beijing, China
| | - Jichen Xu
- National Engineering Laboratory for Tree Breeding, Beijing Forestry University, Beijing, China
- * E-mail:
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Gallego B, Martos S, Cabot C, Barceló J, Poschenrieder C. Zinc hyperaccumulation substitutes for defense failures beyond salicylate and jasmonate signaling pathways of Alternaria brassicicola attack in Noccaea caerulescens. PHYSIOLOGIA PLANTARUM 2017; 159:401-415. [PMID: 27734509 DOI: 10.1111/ppl.12518] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2016] [Revised: 09/23/2016] [Accepted: 10/04/2016] [Indexed: 05/24/2023]
Abstract
The hypothesis of metal defense as a substitute for a defective biotic stress signaling system in metal hyperaccumulators was tested using the pathosystem Alternaria brassicicola-Noccaea caerulescens under low (2 µM), medium (12 µM) and high (102 µM) Zn supply. Regardless the Zn supply, N. caerulescens responded to fungal attack with the activation of both HMA4 coding for a Zn transporter, and biotic stress signaling pathways. Salicylate, jasmonate, abscisic acid and indoleacetic acid concentrations, as well as biotic stress marker genes (PDF1.2, CHIB, LOX2, PR1 and BGL2) were activated 24 h upon inoculation. Based on the activation of defense genes 24 h after the inoculation an incompatible fungal-plant interaction could be predicted. Nonetheless, in the longer term (7 days) no effective protection against A. brassicicola was achieved in plants exposed to low and medium Zn supply. After 1 week the biotic stress markers were even further increased in these plants, and this compatible interaction was apparently not caused by a failure in the signaling of the fungal attack, but due to the lack of specificity in the type of the activated defense mechanisms. Only plants receiving high Zn exhibited an incompatible fungal interaction. High Zn accumulation in these plants, possibly in cooperation with high glucosinolate concentrations, substituted for the ineffective defense system and the interaction turned into incompatible. In a threshold-type response, these joint effects efficiently hampered fungal spread and, consequently decreased the biotic stress signaling.
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Affiliation(s)
- Berta Gallego
- Plant Physiology Laboratory, Bioscience Faculty, Universitat Autònoma de Barcelona, Bellaterra, E-08193, Spain
| | - Soledad Martos
- Plant Physiology Laboratory, Bioscience Faculty, Universitat Autònoma de Barcelona, Bellaterra, E-08193, Spain
| | - Catalina Cabot
- Biology Department, Universitat de les Illes Balears, Palma de Mallorca, E-07122, Spain
| | - Juan Barceló
- Plant Physiology Laboratory, Bioscience Faculty, Universitat Autònoma de Barcelona, Bellaterra, E-08193, Spain
| | - Charlotte Poschenrieder
- Plant Physiology Laboratory, Bioscience Faculty, Universitat Autònoma de Barcelona, Bellaterra, E-08193, Spain
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Liedschulte V, Laparra H, Battey JND, Schwaar JD, Broye H, Mark R, Klein M, Goepfert S, Bovet L. Impairing both HMA4 homeologs is required for cadmium reduction in tobacco. PLANT, CELL & ENVIRONMENT 2017; 40:364-377. [PMID: 27880006 DOI: 10.1111/pce.12870] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2016] [Revised: 10/18/2016] [Accepted: 11/15/2016] [Indexed: 05/26/2023]
Abstract
In tobacco, the heavy metal P1B-ATPases HMA4.1 and HMA4.2 function in root-to-shoot zinc and cadmium transport. We present greenhouse and field data that dissect the possibilities to impact the two homeologous genes in order to define the best strategy for leaf cadmium reduction. In a first step, both genes were silenced using an RNAi approach leading to >90% reduction of leaf cadmium content. To modulate HMA4 function more precisely, mutant HMA4.1 and HMA4.2 alleles of a Targeting Induced Local Lesions IN Genomes (TILLING) population were combined. As observed with RNAi plants, knockout of both homeologs decreased cadmium root-to-shoot transfer by >90%. Analysis of plants with segregating null and wild-type alleles of both homeologs showed that one functional HMA4 allele is sufficient to maintain wild-type cadmium levels. Plant development was affected in HMA4 RNAi and double knockout plants that included retarded growth, necrotic lesions, altered leaf morphology and increased water content. The combination of complete functional loss (nonsense mutation) in one homeologous HMA4 gene and the functional reduction in the other HMA4 gene (missense mutation) is proposed as strategy to limit cadmium leaf accumulation without developmental effects.
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Affiliation(s)
- Verena Liedschulte
- PMI R&D, Philip Morris Products SA (part of Philip Morris International group of companies), Neuchâtel, Switzerland
| | - Hélène Laparra
- PMI R&D, Philip Morris Products SA (part of Philip Morris International group of companies), Neuchâtel, Switzerland
| | - James Nicolas Duncan Battey
- PMI R&D, Philip Morris Products SA (part of Philip Morris International group of companies), Neuchâtel, Switzerland
| | - Joanne Deborah Schwaar
- PMI R&D, Philip Morris Products SA (part of Philip Morris International group of companies), Neuchâtel, Switzerland
| | - Hervé Broye
- PMI R&D, Philip Morris Products SA (part of Philip Morris International group of companies), Neuchâtel, Switzerland
| | - Régis Mark
- PMI R&D, Philip Morris Products SA (part of Philip Morris International group of companies), Neuchâtel, Switzerland
| | - Markus Klein
- PMI R&D, Philip Morris Products SA (part of Philip Morris International group of companies), Neuchâtel, Switzerland
| | - Simon Goepfert
- PMI R&D, Philip Morris Products SA (part of Philip Morris International group of companies), Neuchâtel, Switzerland
| | - Lucien Bovet
- PMI R&D, Philip Morris Products SA (part of Philip Morris International group of companies), Neuchâtel, Switzerland
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Blande D, Halimaa P, Tervahauta AI, Aarts MG, Kärenlampi SO. De novo transcriptome assemblies of four accessions of the metal hyperaccumulator plant Noccaea caerulescens. Sci Data 2017; 4:160131. [PMID: 28140388 PMCID: PMC5283065 DOI: 10.1038/sdata.2016.131] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2016] [Accepted: 11/24/2016] [Indexed: 11/09/2022] Open
Abstract
Noccaea caerulescens of the Brassicaceae family has become the key model plant among the metal hyperaccumulator plants. Populations/accessions of N. caerulescens from geographic locations with different soil metal concentrations differ in their ability to hyperaccumulate and hypertolerate metals. Comparison of transcriptomes in several accessions provides candidates for detailed exploration of the mechanisms of metal accumulation and tolerance and local adaptation. This can have implications in the development of plants for phytoremediation and improved mineral nutrition. Transcriptomes from root and shoot tissues of four N. caerulescens accessions with contrasting Zn, Cd and Ni hyperaccumulation and tolerance traits were sequenced with Illumina Hiseq2000. Transcriptomes were assembled using the Trinity de novo assembler and were annotated and the protein sequences predicted. The comparison against the BUSCO plant early release dataset indicated high-quality assemblies. The predicted protein sequences have been clustered into ortholog groups with closely related species. The data serve as important reference sequences in whole transcriptome studies, in analyses of genetic differences between the accessions and other species, and for primer design.
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Affiliation(s)
- Daniel Blande
- University of Eastern Finland, Department of Environmental and Biological Sciences, Kuopio 70210, Finland
| | - Pauliina Halimaa
- University of Eastern Finland, Department of Environmental and Biological Sciences, Kuopio 70210, Finland
| | - Arja I Tervahauta
- University of Eastern Finland, Department of Environmental and Biological Sciences, Kuopio 70210, Finland
| | - Mark G.M. Aarts
- Wageningen University, Laboratory of Genetics, Wageningen 6708 PB, The Netherlands
| | - Sirpa O Kärenlampi
- University of Eastern Finland, Department of Environmental and Biological Sciences, Kuopio 70210, Finland
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Suryawanshi V, Talke IN, Weber M, Eils R, Brors B, Clemens S, Krämer U. Between-species differences in gene copy number are enriched among functions critical for adaptive evolution in Arabidopsis halleri. BMC Genomics 2016; 17:1034. [PMID: 28155655 PMCID: PMC5259951 DOI: 10.1186/s12864-016-3319-5] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Background Gene copy number divergence between species is a form of genetic polymorphism that contributes significantly to both genome size and phenotypic variation. In plants, copy number expansions of single genes were implicated in cultivar- or species-specific tolerance of high levels of soil boron, aluminium or calamine-type heavy metals, respectively. Arabidopsis halleri is a zinc- and cadmium-hyperaccumulating extremophile species capable of growing on heavy-metal contaminated, toxic soils. In contrast, its non-accumulating sister species A. lyrata and the closely related reference model species A. thaliana exhibit merely basal metal tolerance. Results For a genome-wide assessment of the role of copy number divergence (CND) in lineage-specific environmental adaptation, we conducted cross-species array comparative genome hybridizations of three plant species and developed a global signal scaling procedure to adjust for sequence divergence. In A. halleri, transition metal homeostasis functions are enriched twofold among the genes detected as copy number expanded. Moreover, biotic stress functions including mostly disease Resistance (R) gene-related genes are enriched twofold among genes detected as copy number reduced, when compared to the abundance of these functions among all genes. Conclusions Our results provide genome-wide support for a link between evolutionary adaptation and CND in A. halleri as shown previously for Heavy metal ATPase4. Moreover our results support the hypothesis that elemental defences, which result from the hyperaccumulation of toxic metals, allow the reduction of classical defences against biotic stress as a trade-off. Electronic supplementary material The online version of this article (doi:10.1186/s12864-016-3319-5) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Vasantika Suryawanshi
- Department of Plant Physiology, Ruhr University Bochum, Universitätsstrasse 150, Bochum, 44801, Germany.,BioQuant, University of Heidelberg, Im Neuenheimer Feld 267, Heidelberg, 69120, Germany
| | - Ina N Talke
- Max Planck Institute of Molecular Plant Physiology, Am Mühlenberg 1, Potsdam, 14476, Germany
| | - Michael Weber
- Department of Plant Physiology, University of Bayreuth, Universitätsstrasse 30, Bayreuth, 95447, Germany
| | - Roland Eils
- Division of Theoretical Bioinformatics, DKFZ, Im Neuenheimer Feld 280, Heidelberg, 69121, Germany.,BioQuant, University of Heidelberg, Im Neuenheimer Feld 267, Heidelberg, 69120, Germany.,Institute of Pharmacy and Molecular Biotechnology, University of Heidelberg, Im Neuenheimer Feld 364, Heidelberg, 69120, Germany
| | - Benedikt Brors
- Division of Theoretical Bioinformatics, DKFZ, Im Neuenheimer Feld 280, Heidelberg, 69121, Germany
| | - Stephan Clemens
- Department of Plant Physiology, University of Bayreuth, Universitätsstrasse 30, Bayreuth, 95447, Germany
| | - Ute Krämer
- Department of Plant Physiology, Ruhr University Bochum, Universitätsstrasse 150, Bochum, 44801, Germany. .,BioQuant, University of Heidelberg, Im Neuenheimer Feld 267, Heidelberg, 69120, Germany.
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Paape T, Hatakeyama M, Shimizu-Inatsugi R, Cereghetti T, Onda Y, Kenta T, Sese J, Shimizu KK. Conserved but Attenuated Parental Gene Expression in Allopolyploids: Constitutive Zinc Hyperaccumulation in the Allotetraploid Arabidopsis kamchatica. Mol Biol Evol 2016; 33:2781-2800. [PMID: 27413047 PMCID: PMC5062318 DOI: 10.1093/molbev/msw141] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Allopolyploidization combines parental genomes and often confers broader species distribution. However, little is known about parentally transmitted gene expression underlying quantitative traits following allopolyploidization because of the complexity of polyploid genomes. The allopolyploid species Arabidopsis kamchatica is a natural hybrid of the zinc hyperaccumulator Arabidopsis halleri and of the nonaccumulator Arabidopsis lyrata We found that A. kamchatica retained the ability to hyperaccumulate zinc from A. halleri and grows in soils with both low and high metal content. Hyperaccumulation of zinc by A. kamchatica was reduced to about half of A. halleri, but is 10-fold greater than A. lyrata Homeologs derived from A. halleri had significantly higher levels of expression of genes such as HEAVY METAL ATPASE4 (HMA4), METAL TRANSPORTER PROTEIN1 and other metal ion transporters than those derived from A. lyrata, which suggests cis-regulatory differences. A. kamchatica has on average about half the expression of these genes compared with A. halleri due to fixed heterozygosity inherent in allopolyploids. Zinc treatment significantly changed the ratios of expression of 1% of homeologous pairs, including genes putatively involved in metal homeostasis. Resequencing data showed a significant reduction in genetic diversity over a large genomic region (290 kb) surrounding the HMA4 locus derived from the A. halleri parent compared with the syntenic A. lyrata-derived region, which suggests different evolutionary histories. We also estimated that three A. halleri-derived HMA4 copies are present in A. kamchatica Our findings support a transcriptomic model in which environment-related transcriptional patterns of both parents are conserved but attenuated in the allopolyploids.
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Affiliation(s)
- Timothy Paape
- Department of Evolutionary Biology and Environmental Studies and Department of Plant and Microbial Biology, University of Zurich, Winterthurerstrasse 190, CH 8057, Switzerland
| | - Masaomi Hatakeyama
- Department of Evolutionary Biology and Environmental Studies and Department of Plant and Microbial Biology, University of Zurich, Winterthurerstrasse 190, CH 8057, Switzerland Functional Genomics Center Zurich, Winterthurerstrasse 190, Zurich, CH 8057, Switzerland
| | - Rie Shimizu-Inatsugi
- Department of Evolutionary Biology and Environmental Studies and Department of Plant and Microbial Biology, University of Zurich, Winterthurerstrasse 190, CH 8057, Switzerland
| | - Teo Cereghetti
- Department of Evolutionary Biology and Environmental Studies and Department of Plant and Microbial Biology, University of Zurich, Winterthurerstrasse 190, CH 8057, Switzerland
| | - Yoshihiko Onda
- Kihara Institute for Biological Research, Yokohama City University, Kanagawa, Japan Cellulose Production Research Team, Biomass Engineering Research Division, RIKEN Center for Sustainable Resource Science, Kanagawa, Japan Sugadaira Montane Research Center, University of Tsukuba, Ueda, Nagano, Japan
| | - Tanaka Kenta
- Sugadaira Montane Research Center, University of Tsukuba, Ueda, Nagano, Japan
| | - Jun Sese
- Artificial Intelligence Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Tokyo, Japan
| | - Kentaro K Shimizu
- Department of Evolutionary Biology and Environmental Studies and Department of Plant and Microbial Biology, University of Zurich, Winterthurerstrasse 190, CH 8057, Switzerland Kihara Institute for Biological Research, Yokohama City University, Kanagawa, Japan
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Silva-Guzman M, Addo-Quaye C, Dilkes BP. Re-Evaluation of Reportedly Metal Tolerant Arabidopsis thaliana Accessions. PLoS One 2016; 11:e0130679. [PMID: 27467746 PMCID: PMC4965157 DOI: 10.1371/journal.pone.0130679] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2015] [Accepted: 05/21/2015] [Indexed: 11/19/2022] Open
Abstract
Santa Clara, Limeport, and Berkeley are Arabidopsis thaliana accessions previously identified as diversely metal resistant. Yet these same accessions were determined to be genetically indistinguishable from the metal sensitive Col-0. We robustly tested tolerance for Zn, Ni and Cu, and genetic relatedness by growing these accessions under a range of Ni, Zn and Cu concentrations for three durations in multiple replicates. Neither metal resistance nor variance in growth were detected between them and Col-0. We re-sequenced the genomes of these accessions and all stocks available for each accession. In all cases they were nearly indistinguishable from the standard laboratory accession Col-0. As Santa Clara was allegedly collected from the Jasper Ridge serpentine outcrop in California, USA we investigated the possibility of extant A. thaliana populations adapted to serpentine soils. Botanically vouchered Arabidopsis accessions in the Jepson database were overlaid with soil maps of California. This provided no evidence of A. thaliana collections from serpentine sites in California. Thus, our work demonstrates that the Santa Clara, Berkeley and Limeport accessions are not metal tolerant, not genetically distinct from Col-0, and that there are no known serpentine adapted populations or accessions of A. thaliana.
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Affiliation(s)
- Macarena Silva-Guzman
- Department of Horticulture and Landscape Architecture, Purdue University, West Lafayette, Indiana, United States of America
| | - Charles Addo-Quaye
- Department of Horticulture and Landscape Architecture, Purdue University, West Lafayette, Indiana, United States of America
| | - Brian P. Dilkes
- Department of Horticulture and Landscape Architecture, Purdue University, West Lafayette, Indiana, United States of America
- * E-mail:
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Lin YF, Hassan Z, Talukdar S, Schat H, Aarts MGM. Expression of the ZNT1 Zinc Transporter from the Metal Hyperaccumulator Noccaea caerulescens Confers Enhanced Zinc and Cadmium Tolerance and Accumulation to Arabidopsis thaliana. PLoS One 2016; 11:e0149750. [PMID: 26930473 PMCID: PMC4773103 DOI: 10.1371/journal.pone.0149750] [Citation(s) in RCA: 59] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2015] [Accepted: 02/04/2016] [Indexed: 11/18/2022] Open
Abstract
Prompt regulation of transition metal transporters is crucial for plant zinc homeostasis. NcZNT1 is one of such transporters, found in the metal hyperaccumulator Brassicaceae species Noccaea caerulescens. It is orthologous to AtZIP4 from Arabidopsis thaliana, an important actor in Zn homeostasis. We examined if the NcZNT1 function contributes to the metal hyperaccumulation of N. caerulescens. NcZNT1 was found to be a plasma-membrane located metal transporter. Constitutive overexpression of NcZNT1 in A. thaliana conferred enhanced tolerance to exposure to excess Zn and Cd supply, as well as increased accumulation of Zn and Cd and induction of the Fe deficiency response, when compared to non-transformed wild-type plants. Promoters of both genes were induced by Zn deficiency in roots and shoots of A. thaliana. In A. thaliana, the AtZIP4 and NcZNT1 promoters were mainly active in cortex, endodermis and pericycle cells under Zn deficient conditions. In N. caerulescens, the promoters were active in the same tissues, though the activity of the NcZNT1 promoter was higher and not limited to Zn deficient conditions. Common cis elements were identified in both promoters by 5' deletion analysis. These correspond to the previously determined Zinc Deficiency Responsive Elements found in A. thaliana to interact with two redundantly acting transcription factors, bZIP19 and bZIP23, controlling the Zn deficiency response. In conclusion, these results suggest that NcZNT1 is an important factor in contributing to Zn and Cd hyperaccumulation in N. caerulescens. Differences in cis- and trans-regulators are likely to account for the differences in expression between A. thaliana and N. caerulescens. The high, constitutive NcZNT1 expression in the stele of N. caerulescens roots implicates its involvement in long distance root-to-shoot metal transport by maintaining a Zn/Cd influx into cells responsible for xylem loading.
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Affiliation(s)
- Ya-Fen Lin
- Laboratory of Genetics, Wageningen University and Research Centre, Droevendaalsesteeg 1, 6708 PB, Wageningen, The Netherlands
| | - Zeshan Hassan
- Laboratory of Genetics, Wageningen University and Research Centre, Droevendaalsesteeg 1, 6708 PB, Wageningen, The Netherlands
| | - Sangita Talukdar
- Laboratory of Genetics, Wageningen University and Research Centre, Droevendaalsesteeg 1, 6708 PB, Wageningen, The Netherlands
| | - Henk Schat
- Institute of Molecular and Cellular Biology, Free University of Amsterdam, De Boelelaan 1085, NL-1081 HV, Amsterdam, The Netherlands
| | - Mark G. M. Aarts
- Laboratory of Genetics, Wageningen University and Research Centre, Droevendaalsesteeg 1, 6708 PB, Wageningen, The Netherlands
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Gupta N, Ram H, Kumar B. Mechanism of Zinc absorption in plants: uptake, transport, translocation and accumulation. REVIEWS IN ENVIRONMENTAL SCIENCE AND BIO/TECHNOLOGY 2016. [PMID: 0 DOI: 10.1007/s11157-016-9390-1] [Citation(s) in RCA: 137] [Impact Index Per Article: 17.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
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41
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Laurent C, Lekeux G, Ukuwela AA, Xiao Z, Charlier JB, Bosman B, Carnol M, Motte P, Damblon C, Galleni M, Hanikenne M. Metal binding to the N-terminal cytoplasmic domain of the PIB ATPase HMA4 is required for metal transport in Arabidopsis. PLANT MOLECULAR BIOLOGY 2016; 90:453-66. [PMID: 26797794 DOI: 10.1007/s11103-016-0429-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2015] [Accepted: 01/03/2016] [Indexed: 05/26/2023]
Abstract
PIB ATPases are metal cation pumps that transport metals across membranes. These proteins possess N- and C-terminal cytoplasmic extensions that contain Cys- and His-rich high affinity metal binding domains, which may be involved in metal sensing, metal ion selectivity and/or in regulation of the pump activity. The PIB ATPase HMA4 (Heavy Metal ATPase 4) plays a central role in metal homeostasis in Arabidopsis thaliana and has a key function in zinc and cadmium hypertolerance and hyperaccumulation in the extremophile plant species Arabidopsis halleri. Here, we examined the function and structure of the N-terminal cytoplasmic metal-binding domain of HMA4. We mutagenized a conserved CCTSE metal-binding motif in the domain and assessed the impact of the mutations on protein function and localization in planta, on metal-binding properties in vitro and on protein structure by Nuclear Magnetic Resonance spectroscopy. The two Cys residues of the motif are essential for the function, but not for localization, of HMA4 in planta, whereas the Glu residue is important but not essential. These residues also determine zinc coordination and affinity. Zinc binding to the N-terminal domain is thus crucial for HMA4 protein function, whereas it is not required to maintain the protein structure. Altogether, combining in vivo and in vitro approaches in our study provides insights towards the molecular understanding of metal transport and specificity of metal P-type ATPases.
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Affiliation(s)
- Clémentine Laurent
- Department of Life Sciences, Center for Protein Engineering (CIP), University of Liège, 4000, Liège, Belgium
| | - Gilles Lekeux
- Department of Life Sciences, Center for Protein Engineering (CIP), University of Liège, 4000, Liège, Belgium
| | - Ashwinie A Ukuwela
- School of Chemistry and Bio21 Molecular Science and Biotechnology Institute, University of Melbourne, Parkville, VIC, 3010, Australia
| | - Zhiguang Xiao
- School of Chemistry and Bio21 Molecular Science and Biotechnology Institute, University of Melbourne, Parkville, VIC, 3010, Australia
| | - Jean-Benoit Charlier
- Department of Life Sciences, Center for Protein Engineering (CIP), University of Liège, 4000, Liège, Belgium
| | - Bernard Bosman
- Laboratory of Plant and Microbial Ecology, Department of Biology, Ecology, Evolution, University of Liège, 4000, Liège, Belgium
| | - Monique Carnol
- Laboratory of Plant and Microbial Ecology, Department of Biology, Ecology, Evolution, University of Liège, 4000, Liège, Belgium
| | - Patrick Motte
- Department of Life Sciences, Center for Protein Engineering (CIP), University of Liège, 4000, Liège, Belgium
- PhytoSYSTEMS, University of Liège, 4000, Liège, Belgium
| | - Christian Damblon
- Chimie Biologique Structurale, Department of Chemistry, University of Liège, Liège, Belgium
| | - Moreno Galleni
- Department of Life Sciences, Center for Protein Engineering (CIP), University of Liège, 4000, Liège, Belgium
| | - Marc Hanikenne
- Department of Life Sciences, Center for Protein Engineering (CIP), University of Liège, 4000, Liège, Belgium.
- PhytoSYSTEMS, University of Liège, 4000, Liège, Belgium.
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Zhang J, Zhang M, Shohag MJI, Tian S, Song H, Feng Y, Yang X. Enhanced expression of SaHMA3 plays critical roles in Cd hyperaccumulation and hypertolerance in Cd hyperaccumulator Sedum alfredii Hance. PLANTA 2016; 243:577-89. [PMID: 26547194 DOI: 10.1007/s00425-015-2429-7] [Citation(s) in RCA: 59] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2015] [Accepted: 10/28/2015] [Indexed: 05/08/2023]
Abstract
The enhanced expression of a P 1B -type ATPase gene ( SaHMA3 ) is essential for Cd hyperaccumulation and hypertolerance in Sedum alfredii Hance. A functional understanding of the mechanism through which hyperaccumulator plants accumulate and tolerate extremely toxic metals is a prerequisite for the development of novel strategies for improving phytoremediation using engineered plants or natural hyperaccumulators as well as biofortification and food crop safety. Most hyperaccumulator species, however, are small and slow-growing, and their potential for large-scale decontamination of polluted soils is limited. Sedum alfredii Hance, the only one metal hyperaccumulator from the Crassulaceae family, is an ideal candidate for gaining a functional understanding of the intra-family hyperaccumulation mechanisms as well as their potential applications. In the present study, we isolated and functionally characterized a P1B-type ATPase gene (SaHMA3) from S. alfredii Hance. SaHMA3 alleles from a hyperaccumulating ecotype (HE) and non-hyperaccumulating ecotype (NHE) were constitutively expressed in both shoot and root and encoded tonoplast-localized proteins, but showed differences in transport substrate specificity and expression level. SaHMA3 h from the HE plant was a Cd transporter. In contrast, SaHMA3n from NHE plants was able to transport both Zn and Cd. SaHMA3 showed a significantly higher constitutive expression level in HE plants than in NHE plants. Furthermore, the expression level of SaHMA3 in the shoots of HE plants was considerably higher than in the roots. Overexpression of SaHMA3h in tobacco plants significantly enhanced Cd tolerance and accumulation and greatly increased the root sequestration of Cd. In summary, our data suggested that SaHMA3 plays critical roles in Cd hyperaccumulation and hypertolerance in Cd hyperaccumulator S. alfredii Hance.
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Affiliation(s)
- Jie Zhang
- MOE Key Laboratory of Environment Remediation and Ecosystem Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Min Zhang
- MOE Key Laboratory of Environment Remediation and Ecosystem Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Md Jahidul Islam Shohag
- MOE Key Laboratory of Environment Remediation and Ecosystem Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Shengke Tian
- MOE Key Laboratory of Environment Remediation and Ecosystem Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058, China.
| | - Haiyan Song
- MOE Key Laboratory of Environment Remediation and Ecosystem Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Ying Feng
- MOE Key Laboratory of Environment Remediation and Ecosystem Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Xiaoe Yang
- MOE Key Laboratory of Environment Remediation and Ecosystem Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058, China.
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Martos S, Gallego B, Sáez L, López-Alvarado J, Cabot C, Poschenrieder C. Characterization of Zinc and Cadmium Hyperaccumulation in Three Noccaea (Brassicaceae) Populations from Non-metalliferous Sites in the Eastern Pyrenees. FRONTIERS IN PLANT SCIENCE 2016; 7:128. [PMID: 26904085 PMCID: PMC4746256 DOI: 10.3389/fpls.2016.00128] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2015] [Accepted: 01/23/2016] [Indexed: 05/08/2023]
Abstract
The Southern slope of the Pyrenees is the meridional limit for the distribution of several Noccaea populations. However, the systematic description of these populations and their hyperaccumulation mechanisms are not well established. Morphological and genetic analysis (ITS and 3 chloroplast regions) were used to identify Noccaea populations localized on non-metallicolous soils during a survey in the Catalonian Pyrenees. Cd and Zn concentrations were analyzed in soils and plants both sampled in the field and grown hydroponically. The expression of selected metal transporter genes was assessed by quantitative PCR. The populations were identified as Noccaea brachypetala (Jord.) F.K. Mey by conspicuous morphological traits. Principal component analysis provided a clear separation among N. brachypetala, Noccaea caerulescens J. Presl & C. Presl and Noccaea occitanica (Jord.) F.K. Mey., three Noccaea species reported in the Pyrenees. Contrastingly, ITS and cpDNA analyses were unable to clearly differentiate these taxa. Differences in the expression of the metal transporter genes HMA3, HMA4, and MTP1 between N. caerulescens and N. brachypetala, and those amongst the N. brachypetala populations suggest differences in the strategies for handling enhanced Cd and Zn availability. This is the first report demonstrating Cd and Zn hyperaccumulation by N. brachypetala both in the field and in hydroponics. This comprehensive study based on taxonomic, molecular, and physiological data allows both the correct identification of this species and the characterization of population differences in hyperaccumulation and tolerance of Zn and Cd.
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Affiliation(s)
- Soledad Martos
- Plant Physiology Laboratory, Bioscience Faculty, Universitat Autònoma de BarcelonaBarcelona, Spain
| | - Berta Gallego
- Plant Physiology Laboratory, Bioscience Faculty, Universitat Autònoma de BarcelonaBarcelona, Spain
| | - Llorenç Sáez
- Botany Laboratory, Bioscience Faculty, Universitat Autònoma de BarcelonaBarcelona, Spain
| | - Javier López-Alvarado
- Botany Laboratory, Bioscience Faculty, Universitat Autònoma de BarcelonaBarcelona, Spain
| | - Catalina Cabot
- Biology Department, Universitat de les Illes BalearsPalma de Mallorca, Spain
| | - Charlotte Poschenrieder
- Plant Physiology Laboratory, Bioscience Faculty, Universitat Autònoma de BarcelonaBarcelona, Spain
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Nouet C, Charlier JB, Carnol M, Bosman B, Farnir F, Motte P, Hanikenne M. Functional analysis of the three HMA4 copies of the metal hyperaccumulator Arabidopsis halleri. JOURNAL OF EXPERIMENTAL BOTANY 2015; 66:5783-95. [PMID: 26044091 PMCID: PMC4566976 DOI: 10.1093/jxb/erv280] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
In Arabidopsis halleri, the HMA4 gene has an essential function in Zn/Cd hypertolerance and hyperaccumulation by mediating root-to-shoot translocation of metals. Constitutive high expression of AhHMA4 results from a tandem triplication and cis-activation of the promoter of all three copies. The three AhHMA4 copies possess divergent promoter sequences, but highly conserved coding sequences, and display identical expression profiles in the root and shoot vascular system. Here, an AhHMA4::GFP fusion was expressed under the control of each of the three A. halleri HMA4 promoters in a hma2hma4 double mutant of A. thaliana to individually examine the function of each AhHMA4 copy. The protein showed non-polar localization at the plasma membrane of the root pericycle cells of both A. thaliana and A. halleri. The expression of each AhHMA4::GFP copy complemented the severe Zn-deficiency phenotype of the hma2hma4 mutant by restoring root-to-shoot translocation of Zn. However, each copy had a different impact on metal homeostasis in the A. thaliana genetic background: AhHMA4 copies 2 and 3 were more highly expressed and provided higher Zn tolerance in roots and accumulation in shoots than copy 1, and AhHMA4 copy 3 also increased Cd tolerance in roots. These data suggest a certain extent of functional differentiation among the three A. halleri HMA4 copies, stemming from differences in expression levels rather than in expression profile. HMA4 is a key node of the Zn homeostasis network and small changes in expression level can have a major impact on Zn allocation to root or shoot tissues.
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Affiliation(s)
- Cécile Nouet
- Functional Genomics and Plant Molecular Imaging, Center for Protein Engineering (CIP), Department of Life Sciences, University of Liège, B-4000 Liège, Belgium
| | - Jean-Benoit Charlier
- Functional Genomics and Plant Molecular Imaging, Center for Protein Engineering (CIP), Department of Life Sciences, University of Liège, B-4000 Liège, Belgium
| | - Monique Carnol
- Laboratory of Plant and Microbial Ecology, Department of Biology, Ecology, Evolution, University of Liège, B-4000 Liège, Belgium
| | - Bernard Bosman
- Laboratory of Plant and Microbial Ecology, Department of Biology, Ecology, Evolution, University of Liège, B-4000 Liège, Belgium
| | - Frédéric Farnir
- Biostatistics and Bioinformatics, FARAH, Faculty of Veterinary Medicine, University of Liège, B-4000 Liège, Belgium
| | - Patrick Motte
- Functional Genomics and Plant Molecular Imaging, Center for Protein Engineering (CIP), Department of Life Sciences, University of Liège, B-4000 Liège, Belgium PhytoSYSTEMS, University of Liège, B-4000 Liège, Belgium
| | - Marc Hanikenne
- Functional Genomics and Plant Molecular Imaging, Center for Protein Engineering (CIP), Department of Life Sciences, University of Liège, B-4000 Liège, Belgium PhytoSYSTEMS, University of Liège, B-4000 Liège, Belgium
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Mandáková T, Singh V, Krämer U, Lysak MA. Genome Structure of the Heavy Metal Hyperaccumulator Noccaea caerulescens and Its Stability on Metalliferous and Nonmetalliferous Soils. PLANT PHYSIOLOGY 2015; 169:674-89. [PMID: 26195571 PMCID: PMC4577401 DOI: 10.1104/pp.15.00619] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2015] [Accepted: 07/16/2015] [Indexed: 05/05/2023]
Abstract
Noccaea caerulescens (formerly known as Thlaspi caerulescens), an extremophile heavy metal hyperaccumulator model plant in the Brassicaceae family, is a morphologically and phenotypically diverse species exhibiting metal tolerance and leaf accumulation of zinc, cadmium, and nickel. Here, we provide a detailed genome structure of the approximately 267-Mb N. caerulescens genome, which has descended from seven chromosomes of the ancestral proto-Calepineae Karyotype (n = 7) through an unusually high number of pericentric inversions. Genome analysis in two other related species, Noccaea jankae and Raparia bulbosa, showed that all three species, and thus probably the entire Coluteocarpeae tribe, have descended from the proto-Calepineae Karyotype. All three analyzed species share the chromosome structure of six out of seven chromosomes and an unusually high metal accumulation in leaves, which remains moderate in N. jankae and R. bulbosa and is extreme in N. caerulescens. Among these species, N. caerulescens has the most derived karyotype, with species-specific inversions on chromosome NC6, which grouped onto its bottom arm functionally related genes of zinc and iron metal homeostasis comprising the major candidate genes NICOTIANAMINE SYNTHASE2 and ZINC-INDUCED FACILITATOR-LIKE1. Concurrently, copper and organellar metal homeostasis genes, which are functionally unrelated to the extreme traits characteristic of N. caerulescens, were grouped onto the top arm of NC6. Compared with Arabidopsis thaliana, more distal chromosomal positions in N. caerulescens were enriched among more highly expressed metal homeostasis genes but not among other groups of genes. Thus, chromosome rearrangements could have facilitated the evolution of enhanced metal homeostasis gene expression, a known hallmark of metal hyperaccumulation.
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Affiliation(s)
- Terezie Mandáková
- Plant Cytogenomics Research Group, Central European Institute of Technology, Masaryk University, 625 00 Brno, Czech Republic (T.M., M.A.L.); andRuhr-Universität Bochum, 44780 Bochum, Germany (V.S., U.K.)
| | - Vasantika Singh
- Plant Cytogenomics Research Group, Central European Institute of Technology, Masaryk University, 625 00 Brno, Czech Republic (T.M., M.A.L.); andRuhr-Universität Bochum, 44780 Bochum, Germany (V.S., U.K.)
| | - Ute Krämer
- Plant Cytogenomics Research Group, Central European Institute of Technology, Masaryk University, 625 00 Brno, Czech Republic (T.M., M.A.L.); andRuhr-Universität Bochum, 44780 Bochum, Germany (V.S., U.K.)
| | - Martin A Lysak
- Plant Cytogenomics Research Group, Central European Institute of Technology, Masaryk University, 625 00 Brno, Czech Republic (T.M., M.A.L.); andRuhr-Universität Bochum, 44780 Bochum, Germany (V.S., U.K.)
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Differences in Copper Absorption and Accumulation between Copper-Exclusion and Copper-Enrichment Plants: A Comparison of Structure and Physiological Responses. PLoS One 2015. [PMID: 26207743 PMCID: PMC4514476 DOI: 10.1371/journal.pone.0133424] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Differences in copper (Cu) absorption and transport, physiological responses and structural characteristics between two types of Cu-resistant plants, Oenothera glazioviana (Cu-exclusion type) and Elsholtzia haichowensis (Cu-enrichment type), were investigated in the present study. The results indicated the following: (1) After 50 μM Cu treatment, the Cu ratio in the xylem vessels of E. haichowensis increased by 60%. A Cu adsorption experiment indicated that O. glazioviana exhibited greater resistance to Cu, and Cu absorption and the shoot/root ratio of Cu were significantly lower in O. glazioviana than in E. haichowensis. (2) An analysis of the endogenous abscisic acid (ABA) variance and exogenous ABA treatment demonstrated that the ABA levels of both plants did not differ; exogenous ABA treatment clearly reduced Cu accumulation in both plants. (3) The leaf stomatal density of O. glazioviana was significantly less than that of E. haichowensis. Guard cells in E. haichowensis plants were covered with a thick cuticle layer, the epidermal hair was more numerous and longer, and the number of xylem conduits in the root was small. (4) The transpiration rate and the stomatal conductance of O. glazioviana were both significantly lower than those of E. haichowensis, regardless of whether the plants were treated with Cu. Taken together, these results indicate that the differences in the structural characteristics between these two plant species, particularly in the characteristics related to plant transpiration, are important factors that govern whether plants acquire or exclude Cu.
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Ricachenevsky FK, Menguer PK, Sperotto RA, Fett JP. Got to hide your Zn away: Molecular control of Zn accumulation and biotechnological applications. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2015; 236:1-17. [PMID: 26025516 DOI: 10.1016/j.plantsci.2015.03.009] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2014] [Revised: 03/12/2015] [Accepted: 03/13/2015] [Indexed: 05/20/2023]
Abstract
Zinc (Zn) is an essential micronutrient for all organisms, with key catalytic and structural functions. Zn deficiency in plants, common in alkaline soils, results in growth arrest and sterility. On the other hand, Zn can become toxic at elevated concentrations. Several studies revealed molecules involved with metal acquisition in roots, distribution within the plant and translocation to seeds. Transmembrane Zn transport proteins and Zn chelators are involved in avoiding its toxic effects. Plant species with the capacity to hyperaccumulate and hypertolerate Zn have been characterized. Plants that accumulate and tolerate high amounts of Zn and produce abundant biomass may be useful for phytoremediation, allowing cleaning of metal-contaminated soils. The study of Zn hyperaccumulators may provide indications of genes and processes useful for biofortification, for developing crops with high amounts of nutrients in edible tissues. Future research needs to focus on functional characterization of Zn transporters in planta, elucidation of Zn uptake and sensing mechanisms, and on understanding the cross-talk between Zn homeostasis and other physiological processes. For this, new research should use multidisciplinary approaches, combining traditional and emerging techniques, such as genome-encoded metal sensors and multi-element imaging, quantification and speciation using synchrotron-based methods.
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Affiliation(s)
- Felipe Klein Ricachenevsky
- Centro de Biotecnologia & Programa de Pós-Graduação em Botânica, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil.
| | - Paloma Koprovski Menguer
- Centro de Biotecnologia & Programa de Pós-Graduação em Botânica, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil; John Innes Centre, Norwich, United Kingdom.
| | - Raul Antonio Sperotto
- Centro de Ciências Biológicas e da Saúde & Programa de Pós-Graduação em Biotecnologia, Centro Universitário UNIVATES, Lajeado, RS, Brazil.
| | - Janette Palma Fett
- Centro de Biotecnologia & Programa de Pós-Graduação em Botânica, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil.
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DeTar RA, Alford ÉR, Pilon-Smits EAH. Molybdenum accumulation, tolerance and molybdenum-selenium-sulfur interactions in Astragalus selenium hyperaccumulator and nonaccumulator species. JOURNAL OF PLANT PHYSIOLOGY 2015; 183:32-40. [PMID: 26074355 DOI: 10.1016/j.jplph.2015.05.009] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2015] [Revised: 05/26/2015] [Accepted: 05/27/2015] [Indexed: 05/02/2023]
Abstract
Some species hyperaccumulate selenium (Se) upwards of 0.1% of dry weight. This study addressed whether Se hyperaccumulators also accumulate and tolerate more molybdenum (Mo). A field survey revealed on average 2-fold higher Mo levels in three hyperaccumulator Astragali compared to three nonaccumulator Astragali, which were not significantly different. Next, a controlled study was performed where hyperaccumulators Astragalus racemosus and Astragalus bisulcatus were compared with nonaccumulators Astragalus drummondii and Astragalus convallarius for Mo accumulation and tolerance, alone or in the presence of Se. When grown on agar media with 0, 12, 24 or 48 mg L(-1) molybdate and/or 0, 1.6 or 3.2 mg L(-1) selenate, all species decreased in biomass with increasing Mo supply. Selenium did not impact biomass at the supplied levels. All Astragali accumulated Mo upwards of 0.1% of dry weight. Selenium levels were up to 0.08% in Astragalus racemosus and 0.04% Se in the other species. Overall, there was no correlation between Se hyperaccumulation and Mo accumulation capacity. However, the hyperaccumulators and nonaccumulators differed in some respects. While none of the species had a higher tissue Mo to sulfur (S) ratio than the growth medium, nonaccumulators had a higher Mo/S ratio than hyperaccumulators. Also, while molybdate and selenate reduced S accumulation in nonaccumulators, it did not in hyperaccumulators. Furthermore, A. racemosus had a higher Se/S ratio than its medium, while the other species did not. Additionally, Mo and Se treatment affected S levels in nonaccumulators, but not in hyperaccumulators. In conclusion, there is no evidence of a link between Se and Mo accumulation and tolerance in Astragalus. Sulfate transporters in hyperaccumulating Astragali appear to have higher sulfate specificity over other oxyanions, compared to nonaccumulators, and A. racemosus may have a transporter with enhanced selenate specificity relative to sulfate or molybdate.
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Affiliation(s)
- Rachael Ann DeTar
- Biology Department, Colorado State University, Fort Collins, CO 80523, USA
| | - Élan R Alford
- Graduate Degree Program in Ecology, Colorado State University, Fort Collins, CO 80523, USA; Department of Forest and Rangeland Stewardship, Colorado State University, Fort Collins, CO 80523, USA
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Meyer CL, Juraniec M, Huguet S, Chaves-Rodriguez E, Salis P, Isaure MP, Goormaghtigh E, Verbruggen N. Intraspecific variability of cadmium tolerance and accumulation, and cadmium-induced cell wall modifications in the metal hyperaccumulator Arabidopsis halleri. JOURNAL OF EXPERIMENTAL BOTANY 2015; 66:3215-27. [PMID: 25873677 PMCID: PMC4449548 DOI: 10.1093/jxb/erv144] [Citation(s) in RCA: 81] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
Certain molecular mechanisms of Cd tolerance and accumulation have been identified in the model species Arabidopsis halleri, while intraspecific variability of these traits and the mechanisms of shoot detoxification were little addressed. The Cd tolerance and accumulation of metallicolous and non-metallicolous A. halleri populations from different genetic units were tested in controlled conditions. In addition, changes in shoot cell wall composition were investigated using Fourier transform infrared spectroscopy. Indeed, recent works on A. halleri suggest Cd sequestration both inside cells and in the cell wall/apoplast. All A. halleri populations tested were hypertolerant to Cd, and the metallicolous populations were on average the most tolerant. Accumulation was highly variable between and within populations, and populations that were non-accumulators of Cd were identified. The effect of Cd on the cell wall composition was quite similar in the sensitive species A. lyrata and in A. halleri individuals; the pectin/polysaccharide content of cell walls seems to increase after Cd treatment. Nevertheless, the changes induced by Cd were more pronounced in the less tolerant individuals, leading to a correlation between the level of tolerance and the extent of modifications. This work demonstrated that Cd tolerance and accumulation are highly variable traits in A. halleri, suggesting adaptation at the local scale and involvement of various molecular mechanisms. While in non-metallicolous populations drastic modifications of the cell wall occur due to higher Cd toxicity and/or Cd immobilization in this compartment, the increased tolerance of metallicolous populations probably involves other mechanisms such as vacuolar sequestration.
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Affiliation(s)
- Claire-Lise Meyer
- Laboratory of Plant Physiology and Molecular Genetics, Université Libre de Bruxelles, 1050 Brussels, Belgium
| | - Michal Juraniec
- Laboratory of Plant Physiology and Molecular Genetics, Université Libre de Bruxelles, 1050 Brussels, Belgium
| | - Stéphanie Huguet
- Laboratoire de Chimie Analytique Bio Inorganique et Environnement, Institut des Sciences Analytiques et de Physico-chimie pour l'Environnement et les Matériaux (IPREM, UMR 5254), Université de Pau et des Pays de l'Adour, 64053 Pau cedex 9, France
| | - Elena Chaves-Rodriguez
- Laboratory of Plant Physiology and Molecular Genetics, Université Libre de Bruxelles, 1050 Brussels, Belgium
| | - Pietro Salis
- Laboratory of Plant Physiology and Molecular Genetics, Université Libre de Bruxelles, 1050 Brussels, Belgium
| | - Marie-Pierre Isaure
- Laboratoire de Chimie Analytique Bio Inorganique et Environnement, Institut des Sciences Analytiques et de Physico-chimie pour l'Environnement et les Matériaux (IPREM, UMR 5254), Université de Pau et des Pays de l'Adour, 64053 Pau cedex 9, France
| | - Erik Goormaghtigh
- Laboratory for the Structure and Function of Biological Membranes, Center for Structural Biology and Bioinformatics, Université Libre de Bruxelles, 1050 Brussels, Belgium
| | - Nathalie Verbruggen
- Laboratory of Plant Physiology and Molecular Genetics, Université Libre de Bruxelles, 1050 Brussels, Belgium
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Isaure MP, Huguet S, Meyer CL, Castillo-Michel H, Testemale D, Vantelon D, Saumitou-Laprade P, Verbruggen N, Sarret G. Evidence of various mechanisms of Cd sequestration in the hyperaccumulator Arabidopsis halleri, the non-accumulator Arabidopsis lyrata, and their progenies by combined synchrotron-based techniques. JOURNAL OF EXPERIMENTAL BOTANY 2015; 66:3201-14. [PMID: 25873676 DOI: 10.1093/jxb/erv131] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Arabidopsis halleri is a model plant for Zn and Cd hyperaccumulation. The objective of this study was to determine the relationship between the chemical forms of Cd, its distribution in leaves, and Cd accumulation and tolerance. An interspecific cross was carried out between A. halleri and the non-tolerant and non-hyperaccumulating relative A. lyrata providing progenies segregating for Cd tolerance and accumulation. Cd speciation and distribution were investigated using X-ray absorption spectroscopy and microfocused X-ray fluorescence. In A. lyrata and non-tolerant progenies, Cd was coordinated by S atoms only or with a small contribution of O groups. Interestingly, the proportion of O ligands increased in A. halleri and tolerant progenies, and they were predominant in most of them, while S ligands were still present. Therefore, the binding of Cd with O ligands was associated with Cd tolerance. In A. halleri, Cd was mainly located in the xylem, phloem, and mesophyll tissue, suggesting a reallocation process for Cd within the plant. The distribution of the metal at the cell level was further discussed. In A. lyrata, the vascular bundles were also Cd enriched, but the epidermis was richer in Cd as compared with the mesophyll. Cd was identified in trichomes of both species. This work demonstrated that both Cd speciation and localization were related to the tolerance character of the plant.
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Affiliation(s)
- Marie-Pierre Isaure
- Laboratoire de Chimie Analytique Bio-Inorganique et Environnement, Institut des sciences analytiques et de physico-chimie pour l'environnement et les matériaux (LCABIE/IPREM-UMR 5254), Université de Pau et des Pays de l'Adour and CNRS, Hélioparc, 2 Av. Pierre Angot, 64053 PAU Cedex 9, France
| | - Stéphanie Huguet
- Laboratoire de Chimie Analytique Bio-Inorganique et Environnement, Institut des sciences analytiques et de physico-chimie pour l'environnement et les matériaux (LCABIE/IPREM-UMR 5254), Université de Pau et des Pays de l'Adour and CNRS, Hélioparc, 2 Av. Pierre Angot, 64053 PAU Cedex 9, France
| | - Claire-Lise Meyer
- Laboratoire de Physiologie et de Génétique Moléculaire des Plantes (LPGMP), Université Libre de Bruxelles, Campus Plaine-ULB, CP 242, Bd du Triomphe, B-1050 Brussels, Belgium
| | - Hiram Castillo-Michel
- European Synchrotron Radiation Facility (ESRF), ID21 Beamline, BP 220, 38043 Grenoble, France
| | - Denis Testemale
- Université Grenoble Alpes, Institut Néel, 38000 Grenoble, France CNRS, Institut Néel, 38042 Grenoble France
| | - Delphine Vantelon
- SOLEIL Synchrotron, LUCIA Beamline, BP48, 91192 Gif sur Yvette, France
| | - Pierre Saumitou-Laprade
- Laboratoire de Génétique et Evolution des Populations Végétales (GEPV-UMR 8198), Université des Sciences et Technologies de Lille and CNRS- Lille 1, 59655 Villeneuve d'Ascq Cedex, France
| | - Nathalie Verbruggen
- Laboratoire de Physiologie et de Génétique Moléculaire des Plantes (LPGMP), Université Libre de Bruxelles, Campus Plaine-ULB, CP 242, Bd du Triomphe, B-1050 Brussels, Belgium
| | - Géraldine Sarret
- Institut des Sciences de la Terre (ISTerre), Université Joseph Fourier and CNRS, BP 53, 38041 Grenoble Cedex 9, France
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